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Basics of Computer


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COMPUTER KNOWLEDGE NOTES..............................................................................
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This lesson introduces key concepts related to how
computers work. Computerrelated
terms are defined and basic computer functions are
explained. In particular,
the following topics are addressed.
  What is a computer?
  What are the components of a computer?
  How does a computer work?
  How does the software work?
  How does a computer process information?
  How does the computer’s memory work?
  How is data stored?
  Why is documentation important?
  What are viruses?
A computer allows users to store and process
information quickly and automatically.
A computer is a programmable machine. It allows the
user to store all sorts of information and then ‘process’
that information, or data, or carry out actions with the
information, such as calculating numbers or organising
Computer: A machine that can receive and store
information and change or process it.
I nformation: Knowledge that is communicated.
Data (pl.): The representation of information in a
formalised manner suitable for communication,
interpretation and processing, generally by a computer
system. Note: the term ‘raw data’ refers to
unprocessed information.
Computers can be generally classified by size and
power, although there can be considerable overlap.
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Following are descriptions of several different types of
Mainframe computers are large-sized, powerful
multi-user computers that can support concurrent
programs. That means, they can perform different
actions or ‘processes’ at the same time. Mainframe
computers can be used by as many as hundreds or
thousands of users at the same time. Large
organisations may use a mainframe computer to
execute large-scale processes such as processing the
organisation’s payroll.
Mini-computers are mid-sized multi-processing
computers. Again, they can perform
several actions at the same time and can support from
4 to 200 users simultaneously.
In recent years the distinction between mini-computers
and small mainframes has become blurred. Often the
distinction depends upon how the manufacturer wants
to market its machines. Organisations may use a mini-
computer for such tasks as managing the information
in a small financial system or maintaining a small
database of information about registrations or
Workstations are powerful, single-user computers.
They have the capacity to store and process large
quantities of data, but they are only used by one
person at a time.
However, workstations are typically linked together to
form a computer network called a local area network,
which means that several people, such as staff in an
office, can communicate with each other and share
electronic files and data.
Computer network: A grouping of computers and
peripherals connected together by telecommunications
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links to enable a group of users to share and exchange
Personal computers (PCs), also called
microcomputers, are the most popular type of
computer in use today. The PC is a small-sized,
relatively inexpensive computer designed for an
individual user. Today, the world of PCs is basically
divided between IBM-compatible and Macintosh-
compatible machines, named after the two computer
manufacturers. Computers may be called ‘desktop’
computers, which stay on the desk, or ‘laptop’
computers, which are lightweight and portable.
Organisations and individuals use PCs for a wide range
of tasks, including word processing, accounting,
desktop publishing, preparation and delivery of
presentations, organisation of spreadsheets and
database management. Entry-level PCs are much more
powerful than a few years ago, and today there is little
distinction between PCs and workstations.
Personal computers (PCs), also called
microcomputers, are the most popular type of
computer in use today. The PC is a small-sized,
relatively inexpensive computer designed for an
individual user. Today, the world of PCs is basically
divided between
IBM-compatible and Macintosh-compatible machines,
named after the two computer manufacturers.
Computers may be called ‘desktop’ computers, which
stay on the desk, or ‘laptop’ computers, which are
lightweight and portable. Organisations and
individuals use PCs for a wide range of tasks, including
word processing, accounting, desktop publishing,
preparation and delivery of presentations, organisation
of spreadsheets and database management.
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Entry-level PCs are much more powerful than a few
years ago, and today there is little distinction between
PCs and workstations.
Computers are made up of two parts: the hardware
and the software.
Hardware: The physical equipment required to create,
use, manipulate and store electronic data.
Software: The computerised instructions that operate
a computer, manipulate the data and execute particular
functions or tasks.
All computers require the following hardware
  central processing unit (CPU)
Central processing unit ( CPU) : The chip or chips at
the heart of a computer that enable it to process data.
Also known as a processor.
Memory: An area within a computer system that holds
data waiting to be processed.
  storage device
Storage device: The place where a computer puts
  input devices : the devices that allow data and
instructions to enter a computer
(such as a keyboard, mouse, scanner)
I nput: Any resource required for the functioning of a
process, in the course of which it will be transformed
into one or more outputs.
  output devices: the devices that allow information
to be represented (that is,
given out) to the user, such as a display screen or
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Output: The product of the transformation of inputs by
a process. Printers, scanners and external disk drives
that may be connected to the computer are
also sometimes called ‘peripheral devices’.
Peripheral device: Any piece of equipment in a
computer system that is not actually inside the
computer itself.
The central processing unit (CPU) is the heart of the
computer. It carries out all of the instructions given in
a program, such as a word processing or spreadsheet
The CPU consists of one or more chips (another name
for “integrated circuits”).
Chip: A small piece of semi-conducting material (such
as silicon) about 1 centimetre (¼ inch) square on
which an integrated circuit is embedded. An integrated
circuit is a number of electronic components joined
together to form a path for electricity. Central
processing unit chips contain the circuits representing
the CPU.
A microprocessor is a particular type of chip. The
original IBM personal computer used the Intel 8088
microprocessor. Most of today’s microcomputers are
designed around a microprocessor from one of two
product families: x86 or Power. The 80286, 80386, and
80486 models that followed were referred to by the
last three digits, 286,386, and 486. For the next
generation, however, Intel broke with tradition and
introduced the Pentium in 1993. In 1997, it introduced
the Pentium II to address multi-media applications, and
most recently the Pentium III to address the new
opportunities provided by access to large volumes of
information on the world wide Web. Other
manufacturers of chips (such as Cyrix) produce chips of
similar power and capabilities.
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CPU’s are not all equal. Some process data faster than
others. A computer contains a system clock that emits
pulses to establish the timing of all systems operations.
The system clock operates at a speed quite different
from a clock that keeps track of the time of the day.
The system clock determines the speed at which the
computer can execute an instruction, and therefore
limits the number of instructions the computer
can complete within a specific amount of time. The
time to complete an instruction execution cycle is
measured in megahertz (MHz) or millions of cycles per
Although some instructions require multiple cycles to
complete, the processor speed should be thought of in
terms of the number of instructions the processor can
execute in one second. Today, microprocessor speeds
exceed 300 MHz. If all other specifications are identical,
then higher megahertz ratings means faster
When determining what type of computer you are
using or considering what type of computer to acquire,
it is important to know that these terms – 286, 386,
486, Pentium
– refer to the type of processor in the computer. Newer
computers will come with Pentium microprocessors (or
the equivalent from other manufacturers); older ones
with microprocessors from the x86 family.
It is important to know the type of processor in your
computer. Some newer computer programs will not run
on older processors, and some newer processors are
too sophisticated for older software.
The faster the processor in a computer, the more
quickly the computer will perform operations.
The most common type of memory that most users are
familiar with is ‘main memory’
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or ‘RAM’ (random-access memory).
Random access memory ( RAM) : An area in the
computer system unit that temporarily holds a user’s
data, operating system instructions and program
The word ‘main’ is used to distinguish it from external
mass storage devices such as the hard drive or disk
drives. Note that the term ‘mass storage’ refers to
various techniques and devices for storing large
amounts of data; mass storage is distinct from memory
because it retains data even when the computer is
turned off. Thus mass storage is sometimes referred to
as ‘auxiliary storage’. Following are definitions of
common storage devices:
Storage: The area within a computer system where
data can be left on a longer term basis while it is not
needed for processing.
Diskette. A small, removable, flexible mylar plastic
disk covered with a thin layer of a magnetisable
substance, onto which digital data can be recorded and
stored. Also known as a floppy disk.
Hard drive: The storage area within the computer
itself, where megabytes of space are available to store
bits of information. Also known as a hard disk.
Optical disk: A storage device that uses reflecting
surfaces and laser technology to read and write data on
a disk. Also known as a laser disk.
Magnetic tape: A continuous plastic strip covered with
magnetic oxide; the tape is divided into parallel tracks
onto which data may be recorded by selectively
magnetising parts of the surface, or spots, in each of
the tracks. The data can then be stored and reused
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A computer functions in the following manner:
  The computer accepts input. Computer input is
whatever is entered or fed into a computer system.
Input can be supplied by a person (such as by using a
keyboard) or by another computer or device (such as a
diskette or CD-ROM). Some examples of input include
the words and symbols in a document, numbers for a
calculation, instructions for completing a process,
pictures, and so on.
  The computer performs useful operations,
manipulating the data in many ways.
This manipulation is called processing. Examples of
processing include performing calculations, sorting lists
of words or numbers, modifying documents
and pictures according to user instructions, and
drawing graphs. A computer
processes data in the CPU.
Process: A systematic series of actions a computer
uses to manipulate data.
  The computer stores data. A computer must
store data so that it is available for processing. Most
computers have more than one location for storing
data (the hard drive or C:\, and the floppy drive or
A:\). The place where the computer stores the data
depends on how the data is being used. The computer
puts the data in one place while it is waiting to be
processed and another place when it is not needed for
immediate processing. The storage of data in the
computer is called ‘online storage’ while the storage of
data on computer tapes, diskettes or CD-ROMs is called
‘offline storage’
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  The computer produces output. Computer
output is information that has been produced by a
computer. Some examples of computer output include
reports,documents, music, graphs, and pictures.
Output can be in several different formats, such as
paper, diskette, or on screen.
A computer receives data as input, processes it, stores
it and then produces output.
Software is the computerised instructions that operate
the computer, execute particular functions or tasks,
and manipulate the data. For software (the
instructions) to perform various functions, it must be
programmed. That is, the instructions need to be
written in a programming language that the computer
can understand. Without a program, a computer is
Programming language: An artificial set of rules,
vocabulary and syntax used to instruct the computer to
execute certain tasks.
Computer program: A sequence of instructions that
can be executed by a computer to carry out a process.
Over the years, a wide range of programming
languages have been developed,
including BASIC, FORTRAN, PASCAL, C++, JAVA, and
so on. Each language has a unique set of words (codes)
that it understands and a special syntax for organising
program instructions.
The language the computer actually understands is
called machine language, which comprises numbers
only. This language is used by the computer to
understand the programming language and translate
the terms into executable instructions. Lying between
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programming languages and machine languages are
assembly languages.
Assembly languages have the same structure and set
of commands as machine languages but they enable a
program to use names instead of numbers.
Please note: most people who use computers today do
not need to worry about programming, machine, or
assembly languages. This is because the software
being used today is written in a highly user-friendly
manner and in a way that does not require knowledge
of the computer languages which were used to create
and use it.
User friendly: Computer software or hardware that is
simple to set up, run and use.
There are two kinds of software, systems software and
applications software.
Systems software includes the operating system and
all the utilities that enable the computer to function.
The most important program that runs on a computer
is the operating system. Every general-purpose
computer must have an operating system in order to
run other programs. This includes controlling functions
such as the coordination of the hardware and
applications software, allocating storage facilities,
controlling the input and output devices and managing
time sharing for linked or networked computers. In
many respects an operating system works like an air
traffic controller to coordinate activities within the
computer. Examples of operating systems are Windows
NT, DOS and OS/2. The Windows family of operating
systems includes a Graphical User Interface (GUI) that
makes the software user friendly.
Operating system: A collection of software that
allows a computer to function.
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Applications software includes programs that users
access to carry out work. They include applications for
the following functions.
  Word processing is the most common applications
software. The great advantage of word processing over
using a typewriter is that you can make changes
without retyping the entire document. Word processors
make it easy to manipulate and format documents.
  Spreadsheets are computer programs that let
people electronically create and manipulate
spreadsheets (tables of values arranged in rows and
columns with predefined relationships to each other).
Spreadsheets are used for mathematical calculations
such as accounts, budgets, statistics and so on.
  Database management applications are computer
programs that let people create and manipulate data in
a database. A database is a collection of related
information that can be manipulated and used to sort
information, conduct statistical analyses or generate
  Presentation packages and graphics are computer
programs that enable users to create highly stylised
images for slide presentations and reports. They can
also be used to produce various types of charts and
graphs. Many software applications include graphics
components including: paint programs, desktop
publishing applications and so on.
  Communications applications typically include
software to enable people to send faxes and emails and
dial into other computers.
Software programs are continually being written or
upgraded to undertake certain tasks. As a result the
software can become obsolete quickly.
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Software can be either ‘proprietary’ (also called
‘closed’) or ‘open’. Proprietary software is privately
owned and controlled. A proprietary software design or
technique is one that is owned by a company, which
will usually not divulge specifications that would allow
other companies to duplicate the product.
Increasingly, proprietary software is seen as a
disadvantage in many organisations; users prefer to
use ‘open’ software, which is software designed using
specifications that are publicly accessible. The great
advantage of open software is that anyone can create
add-on products for it because they can understand
how it was designed.
When data is input into a computer, the numbers or
words we understand are translated into a binary
numbers system. Binary is the language of computers.
Everything you type, input, output, send, retrieve,
draw and so on is, in the end, converted to the
computer’s native language: binary.
Binary number system: A numerical system wherein
each digit stands for a power of two. The binary system
uses only two symbols, 0 and 1, to represent values.
In the decimal system, commonly used in most
countries, each digit represents a value
of 10. For example, the number 103 would break down
as follows:
1 x 100 = 100
0 x 10 = 0
3 x 1 = 3
103 = 103
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In the binary system, each digit position represents a
value of 2. Because computers use the binary system,
powers of 2 play an important role. This is why
everything in computers seems to come in 8s (2 to the
3rd power), 64s (2 to the 6th power), 128s (2
to the 7th power), and 256s (2 to the 8th power).
Therefore, in the binary system, the number 103 would
break down as follows:
1 x 64 = 64
1 x 32 = 32
0 x 16 = 0
0 x 8 = 0
1 x 4 = 4
1 x 2 = 2
1 x 1 = 1
1100111 = 103
The values in a binary system -- the 0s and 1s -- are
called ‘binary digits’ or bits.
Binary digit ( bit) : A digit within the binary number
system. A bit is the smallest unit of information held in
a computer.
The computer’s electronic circuits have only two states,
on or off, and therefore can only understand 0s and 1s,
which may represent such opposites as on or off, yes
or no, or up or down. This is why all computers use the
binary system. In order to make the bits useful, they
are combined into ‘bytes’ of information.
Byte: A combination of bits that represent one
character. A byte is usually composed of 8 bits
Computer programmers have developed codes for
various bytes of information, so that they may be read
by different computer programs. For example, one
code might define the letter A as ‘11000001’ and the
letter B as 11000010’.
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The number 6 might be defined as ‘11110110’ and the
number 8 as ‘11111000’. When the person entering
data strikes the A key on the keyboard, the computer
registers it as ‘11000001’. When he or she enters the
B, the computer reads it as ‘11000010’. Similarly, the
number 6 is understood by the computer as ‘11110110’
and the number 8 as ‘1111100’. In this way, the
computer can store words and numbers as binary digits
and then retrieve them and convert them back into
words or numbers as required.
As discussed earlier, this work of manipulating, storing
and processing the data takes place in the Central
Processing Unit, the computer’s main memory. The
CPU consists of an arithmetic and logic unit, or ALU, a
control unit, and a set of registers.
  The arithmetic and logic unit is the portion of the
CPU where arithmetic and logical operations take place.
  The control unit is the part of the CPU that
supervises the general operations of the computer.
  The registers are devices that hold data inside the
computer’s memory long enough to execute a
particular function, such as indexing, calculating,
sorting or otherwise manipulating data. They are the
CPU’s own internal memory.
Data travels from one part of the computer to another
through a kind of path known as a bus.
Bus: The channel or path that lets the parts of a
computer communicate with each other.
Similar to a school bus for school children, a computer
data bus picks up a load of data from one of the
components on the main computer board and then
transfers the data to another component on the main
computer board. The main circuit board of a
microcomputer is also known as the motherboard. The
motherboard is the principal board that has connectors
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for attaching devices to the bus. Typically, it contains
the CPU, memory and basic controllers for the system.
The data bus is really a series of electrical circuits that
connect the various electrical elements on the main
The data are input into the computer and processed in
the CPU. They travel along the bus to be stored in the
computer’s memory. The amount of memory available
is described in bytes of information, referring to the
combination of bits representing characters. The higher
the number of bytes the more memory the computer
Today’s computers hold ‘megabytes’ or even
‘gigabytes’ of data. A megabyte is a unit of one million
bytes; a gigabyte is one billion bytes, and a terabyte is
one trillion bytes. If a computer has a memory of 64
megabytes, then it can hold 64 million bytes of
Data can be stored so that it is readable again only
using the software with which it was created, or it can
be stored in other formats, so that it may be
transferred or used by other software programs. There
is a standard character code used to store data so
that it may be used by other software programs; this
code is called ASCII or American Standard Code for
Information Interchange. The ASCII code assigns a
specific pattern of bits to each character, as described
above. Another code that may be found, especially in
IBM-brand mainframe computers, is EBCDIC, or
Extended Binary Coded Decimal Interchange Code. The
important point to remember about these codes is that
their main value is to store information so that it is
readable by other computers. By using ASCII or
EBCDIC, it is possible for people to retrieve and use
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someone else’s data using a different type of hardware
or software. The main disadvantage of using ASCII or
EBCDIC is that the formatting or other special
qualities of computerised information may be lost.
As defined earlier, memory refers to the temporary
internal storage areas within a computer. The term
memory is usually used as shorthand for ‘physical
memory’, which refers to the actual chips capable of
holding data. Some computers also use ‘virtual
memory’, which expands physical memory onto a hard
The main type of memory and the most familiar to
users is random access memory (RAM). RAM is the
same as main memory. A computer can both write data
into RAM and read data from RAM.
Every time a user turns on his or her computer, a set
of operating instructions is copied from the hard disk
into RAM. These instructions, which help control basic
computer functions, remain in RAM until the computer
is turned off. Most RAM is volatile, which means that it
requires a steady flow of electricity to maintain its
contents. As soon as the power is turned off, whatever
data was in RAM disappears.
The contents of RAM are necessary for the computer to
process data. The results of the processing are kept
temporarily in RAM until they are needed again or until
they are saved onto the hard disk or other storage
Today the storage capacity of RAM is measured in
megabytes (MB). PCs (microcomputers) typically have
between 16 and 64 MB of RAM, which means they
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can hold between 16 and 64 million bytes of data (a
standard A4 page of text typically holds about 2,000
bytes or characters of text).
Other types of memory include
  ROM (read only memory): unlike RAM, ROM is non-
volatile and only permits the user to read data.
Computers almost always contain a small amount of
read-only memory that holds instructions for starting
up the computer.
  PROM (programmable read-only memory): a PROM
is a memory chip on which you can store a program.
Once the PROM has been used, you cannot wipe it
clean and use it to store something else. Like ROMs,
PROMs are non-volatile.
  EPROM (erasable programmable read-only
memory): an EPROM is a special type of PROM that can
be erased by exposing it to ultraviolet light.
  EEPROM (electrically erasable programmable read-
only memory): an EEPROM is a special type of PROM
that can be erased by exposing it to an electrical
Back up: To copy a computer file or collection of files
to a second medium, usually on a diskette or magnetic
tape, so that the data are safe in case the original file
is damaged or lost. Backups are usually copied to
storage devices that can be removed from the
computer and kept separately from the original.
A tape backup is a copy of the data from a hard disk,
stored on magnetic tape and used to recover lost data.
A tape backup is relatively inexpensive and can rescue
an organisation from the overwhelming task of trying
to reconstruct lost data.
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Backing up electronic data is critical to protecting it
from loss or damage.For more information on backing
up data and protecting information, see Automating
Records Services and Emergency Planning for Records
and Archives Services.
The most popular types of tape drives for
microcomputers also use tape cartridges, but
there are several tape specifications and cartridge
sizes. A tape cartridge is a removable magnetic tape
module similar to a sound or video cassette tape.
Quarter inch tape, called QIC, is a tape cartridge that
contains ¼ inch (approximately ½ centimetre) wide
tape. Depending on tape length, QIC tape capacities
range from 340 MB to 2 gigabytes. Digital audio tape,
called DAT, was originally an audio recording format,
but is now also used for data storage. The 4mm wide
DAT tape format storage capacity ranges from 2
gigabytes to 12 gigabytes.
In addition to magnetic storage, there is also optical
Optical disk: A storage device that uses reflecting
surfaces and laser technology to read and write data on
a disk. Also known as a laser disk.
With optical storage, data is burned into the storage
medium using beams of laser light. The burns form
patterns of small pits in the disk surface to represent
data. The pits on optical media are permanent, so the
data cannot be changed. Optical media are
very durable, but they do not provide the flexibility of
magnetic media for changing the data once they are
There are three types of optical disks.
  CD-ROM’s are the most popular type of optical
storage. CD-ROM stands for Compact Disc Read Only
Memory. A computer CD-ROM disk, like its audio
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counterpart, contains data that has been stamped on
the disk surface as a series of pits. To read the data on
a CD-ROM an optical read head distinguishes the
patterns of pits that represent bytes. CD-ROM disks
provide tremendous storage capacity. CD-ROMs usually
come with data already written onto them. These days
most applications software is provided on CD-ROM.
  It is now possible for computer users to write data
to an optical disk. These are known as WORM disks,
which stands for ‘Write Once Read Many’. A single CD
holds up to 680 megabytes, equivalent to over 300,000
pages of text in character format, and these disks are
quite durable. These CDs are know as CD re-recordable
(CD-R). There are other types of WORM disks, although
there is no standard for these.
  There is a third type of optical disk which can be
erased and use to rewrite new information. These are
sometimes known as EO (erasable optical) disks and
CD-RW (CD rewritable).
Magneto-optical disks combine magnetic disk and CD-
ROM technologies. Like magnetic media they can read
and written to and like floppy disks they are
They can store over 200 MB of data, and speed of
access to this data is faster than a floppy but slower
than a hard drive. There is no universal standard for
these yet.
CD-ROMs and magnet-optical disks are very useful for
storing images. These take up much more storage
space than data in character format, such as in word-
processed files.
The computer hardware, software and peripherals will
be accompanied by documentation, which explains how
the various systems or programs operate.
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Documentation: Information needed to develop, use
or maintain computer hardware and software and to
permit access and retrieval of the data.
Although documentation usually comes in the form of
printed manuals, guide books, it may also come in
electronic form, such as in ‘help screens’ contained
within the computer software or documentation in data
dictionaries and so on. Often, documentation is created
when a specific computer application is used. For
example, if a government office creates a data base of
employees in order to administer payroll,
documentation may be created describing how the
database was established, what it is to be used for and
what data fields have been created. This
documentation can be critical to understanding the
database system, particularly if it is being managed in
an archival environment long after the creators of the
system have left.
Documentation should always be retained.
Disposing of documentation can cause problems in the
future, particularly if you have to reload software from
the beginning. Documentation can also contain licences
for the legitimate use of the software. Therefore it is
critical to protect documentation and ensure it is
readily available.
Virus: A computer program that is planted in one
computer and then transferred, hidden in useful
information, to one or more other computers with the
intention of corrupting or wiping out information in the
recipient computer.
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Viruses are extremely common. Many different types of
viruses exist, ranging from ones that prevent you from
opening up word-processed documents through to ones
that destroy the entire contents of a hard drive. Viruses
can be caught in several ways, for example by
exchanging floppy disks, via electronic mail messages
and through downloading documents from the Web.
Networks make it much easier for viruses to move
around. Once a virus gets into an organisation’s
computer system it can spread very quickly. New
viruses appear each week, so it is essential that users
have up-todate anti-virus software to combat this
If users have software that is unlicenced it could mean
that it is ‘pirate’ or ‘bootleg’ software. This is software
that has been illegally copied. Software of this nature
sometimes contains viruses that can be extremely
damaging to computers.
This lesson examines three computer environments:
mainframe computing, networks (such as Intranets),
and the Internet. It introduces key concepts related to
how mainframes, networks and the Internet work.
Please remember, this lesson is not intended to provide
a comprehensive explanation of the technical details of
mainframe computing, networks and the Internet.
Information is provided in order to introduce you to key
concepts and provide an overview of these computing
Mainframe computing developed at a time when
computational power was an expensive and scarce
resource. In order to use the expensive computer
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technologies efficiently, organisations had to share
their resources. Many of computerised
applications, such as invoicing, purchasing, payroll,
accounting and so on, involved the organisation as a
If the original reasons for the mainframe computing
model were cost and scarcity of resources, the current
reasons for sharing computer power are
  security: the protection of data from outside or
unauthorised access
  integrity: the guarantee that the data is not
corrupted and that repeatability is achievable using the
same applications and data
  system availability: centralised facilities can be
operated by teams in shifts 24 hours a day, maximising
the investment in IT equipment and allowing large
data processing activities to be carried out efficiently
  data sharing: data input or created in one part of
the organisation becomes available to other parts
  applications: many modern applications, such as
personnel management systems, require access to a
shared pool of resources.
Today, mainframe computing is no longer an expensive
resource; sharing is still a cost-effective means of
providing computational power. Recent studies have
shown that on a per-user basis, mainframe computing
provides the least expensive form of computing.
A mainframe environment involves not just the
hardware. The security, integrity and availability of the
mainframe system can only be achieved if the
computer centre is staffed by people with the
necessary skills, operated according to a set of
practices and managed with the discipline (that is, the
processes and procedures) that ensures the
appropriate levels of security, integrity and availability.
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This is the ‘mainframe environment’.In a mainframe
environment, many people share access to a
mainframe computer.
A large central processor is kept in a purpose-built
computer centre staffed by personnel responsible for
maintaining it. Individuals in the organisation access
the mainframe computer through terminals on their
desktops in order to share common organisational
resources, such as software programs or electronic
data. As we use the term today, a mainframe is
actually identified more by the ‘environment’ in which
the mainframe is operated. In other words, the
physical environment: the controlled temperature and
humidity and the physical security of having the
mainframe behind locked doors.
Mainframe computers are used as tools to support a
given ‘business’ application such as
  processing applications for licences
  processing government payroll information
  processing financial accounts
  processing environmental resource information.
In all of these applications, the common denominator is
the work process and the rules for undertaking the
process. Everyone is undertaking a part of the whole
work process and everyone must complete his or her
work in accordance with the procedures required to
make sure the job is done satisfactorily and the data
are complete and consistent.
For example, if ten people are responsible for
managing government payroll, each will have a
separate responsibility. They will all have access to the
same database through the mainframe computer, and
each person must complete his or her task adequately
before the ‘job’ can be considered complete.
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The automation of a given work process, such as
processing government payroll information, is often
viewed as an information system.
I nformation system: The combination of information,
technology, processes and people brought together to
support a given business objective.
The mainframe is the data and application repository
for most organisations. It is also the hub for most
online business activities. It is believed that
mainframes still house 90 per cent of the data major
organisations rely on to conduct their business. Despite
claims that mainframe technology is dying out, sales of
mainframe hardware and software remain steady. The
term ‘mainframe’ has always had the image of being
something large in size. Yet, however big the early
‘room-filling’ mainframes were, today’s modern
versions are no bigger than the size of a household
refrigerator. The level of mainframe sophistication has
grown over the more than thirty years of its evolution;
organisations still recognise its advantages in terms of
performance, reliability and security.
A network computing environment is one in which an
organisation has linked together personal computers
that have been connected into a network.
There are a number of types of computer networks.
Local area network: A computer network located
within a relatively limited area such as a building,
agency or university campus. Also known as a LAN.
Wide area network ( WAN) : A computer network that
covers a large geographical area.
There are an estimated 25 million computers connected
to local area networks world wide. The purpose of
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networking personal computers and even mainframes
together is to permit employees in the organisation to
  communicate with one another as well as others
outside the organisation, normally through the use of
electronic messages
  access information and services supported on the
World Wide Web
  share documents and data
  support various work processes in the organisation
based on the automation of specific tasks.
A network environment can range in sophistication
from very simple to very complex.
Some networks are used to support simple electronic
mail communication. In other networks, employees
may be able to share documents with each other and
carry out the work of their work groups, project teams,
etc. by exchanging electronic documents
through e-mail. The most sophisticated organisations
may have automated entire work processes. For
instance, draft documents such as responses to letters
sent to senior officials, are sent through various
approval levels (such as action officer to manager to
director to senior official) without ever being printed
onto paper (except perhaps the final version, which
needs to be signed by the senior official).
A computer network can be simple and limited to a
small number of computers or complex, linking a large
number of computers.
A computer that is not connected to a network is
referred to as a stand-alone computer. When a
computer is physically connected to a local area
network, using a cable or other communications
channel, the computer becomes a workstation on the
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network. Each device on the network including
workstations, servers, and printers is referred to as a
Node: A processing location on a network.
A workstation normally has all of the usual resources
found in the personal computing environment (hard
drive, software, data and printer). However, users of
workstations will also have access to network
resources, which typically include application software,
storage space for data files, and printers other than
those on the local workstation. On a network, the
network server typically provides the applications
software and storage space for data files.
Network server: A computer that is connected to the
network and that ‘serves’ or distributes resources to
network users.
Networks use different kinds of servers to carry out
specialised functions. For example, a file server is a
computer and storage device dedicated to storing files.
File server: A computer that serves or distributes
application programs and data files to workstations
within a computer network. The hard drive of the file
server is shared by the workstations on the network.
Any user on the network can store files on the server.
Other types of servers include a print server to manage
one or more printers and a database server to process
database queries.
Most network users will need to understand file servers
because this is where they will store their files on the
network. A typical local area network uses a powerful
PC as a file server. However, a minicomputer or
mainframe computer can also be a file server. File
servers fall into three categories; dedicated, non-
dedicated and application servers.
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A dedicated file server is devoted only to the task of
delivering programs and data
files to workstations. A dedicated file server does not
process data or run programs
for the workstations. Instead, programs run using the
memory and processor of the workstation.
In some cases, a network computer performs a dual
role as both file server and workstation. When a non-
dedicated file server is used, the computer workstation
functions like a normal workstation, but other
workstations can access programs and data files from
the hard disk of the user’s computer workstation.
An application server is a computer that runs
applications software and runs the results of processing
to workstations as requested. An application server
makes it possible to use the processing power of both
the server and the workstation. Use of an application
server splits processing between the workstation client
and the network server. The method is also referred to
as client/server architecture.
Some networks include a host computer, usually a
minicomputer or mainframe attached with terminals. A
terminal has a keyboard and screen but does not have
a local storage device and does no processing on its
own. When a terminal is connected to a host computer,
all processing takes place on the host.
The software on a local area network typically includes
many of the same applications one might use in a
personal computing environment, such as word
processing, spreadsheet, database management and so
on. As the use of networks increase, however,
organisations have begun to demand software that
facilitate the flow and sharing of documents. This
software includes groupware and workflow software.
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Groupware: Applications software that supports
collaborative work between a group of users by
managing schedules, sharing documents and
undertaking intragroup communications.
Essentially, groupware manages a pool of documents
and allows users to access those documents
simultaneously. A key feature of groupware is
document version management which maintains all
revisions within a document when more than one
group member revises a document.
I ntranet: An internal computer network that belongs
toan organisation and is accessible only by that
organisation’s members.
The Internet evolved over the past thirty years from a
fledging experiment with four computers into a vast
information network that connects millions of
microcomputers, minicomputers and mainframe
computers. As of 1998, the Internet had more than
100 million users world wide, and that number is
growing rapidly. The Internet is decentralised by design
and, remarkably, this anarchy by design works well.
I nternet: A collection of local, regional and national
computer networks that are linked together to
exchange data and distribute processing tasks.
There are a variety of ways to access the Internet, the
most common being through an Internet Service
Provider (ISP). An ISP is a company that charges an
ongoing fee for providing Internet access to
businesses, organisations and individuals. The ISP
provides the user with the necessary communications
software (such as e-mail) and user account. The user
supplies a modem that connects the computer to the
user’s phone line. The user’s computer dials the ISP’s
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computer and establishes a connection over the phone
line. Once connected the ISP routes data between the
user’s computer and the Internet. Most ISPs offer dial-
up Internet connections and electronic mail access,
along with additional services. Some ISPs offer direct
access to the Internet without the use of proprietary
The Internet connects millions of people through a
collection of computer networks.
A connection that uses a phone line to establish a
temporary connection to the Internet is referred to as
a dial-up connection. When the user’s computer hangs
up, the connection is broken. A phone line provides a
very narrow pipe for transmitting data.
Its typical capacity is only 28.8 thousand bits per
second (bps). Using a phone line, the time to transfer
the contents of a 680 megabyte CD-ROM would be over
53 hours.
More rapid digital data transmission is now available
from some telecoms providers in various parts of the
The World Wide Web was created in 1990 as an easy-
to-use source of information.
World Wide Web: A computer network system that
allows users to browse through information available
on computers round the world.
The World Wide Web opened the Internet to millions of
people interested in finding information. There are over
one million Web sites around the world and the number
is growing very quickly. The World Wide Web consists
of documents called Web pages that contain
information on a particular topic. A Web page might
also contain one or more links that point to other Web
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Link: A reference to another document in an
environment like the World Wide Web, that users can
go to directly by clicking on the on-screen reference
with the computer’s mouse.
Links make it easy to follow a thread of related
information, even if the pages are stored on computers
located in different countries. Every Web page is stored
as an HTML (HyperText Markup Language) document.
HyperText Markup Language ( HTML) : One of the
main standards that controls how the World Wide Web
works; it is an SGML document type definition that
determines how Web pages are formatted and
displayed and thus enables information to be
exchanged on the World Wide Web.
Standardised General Mark- up Language (SGML) :
A metalanguage that can be applied to documents in
order to maintain their structure and context.
An HTML document contains special instructions called
HTML tags that tell a Web browser how to display the
text, graphics, and background of a Web page.
Web browsers are used to view Web pages, transfer
files between computers, access commercial
information services, send e-mail, and interact with
other Internet users.
Web browser: A software application that enables a
user to locate and view pages on a Web site. Also
known as a browser.
To request a Web page the user either types in the URL
(Uniform Resource Locator)
address or uses a ‘mouse’ to click on a Web page link.
Uniform Resource Locator ( URL) : The global
address of documents and other resources on the
World Wide Web. URLs can point to executable files
that can be fetched using FTP (file transfer protocol,
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ftp://) or a Web page that can be retrieved using HTTP
(hypertext transfer protocol, http://).
After the http://, the next segment of the address is
the server name. The server is the computer and
software that make the data available. A Web server,
for instance, is a computer that uses Web server
software to transmit Web pages over the Internet.
Most Web servers have domain names prefixed with
WWW. By entering the Web server name, one accesses
the site’s home page.
Home page: The main page of a Website. Typically,
the home page serves as an index or table of contents
to other documents stored at the site (that is, the
Website: A location on the World Wide Web.
A home page is similar to the title page and table of
contents in a book. It identifies the site and contains
links to other pages at the site. The following is an
example of a home page belonging to the ICA, viewed
using a particular type of browser software called
Microsoft Explorer.
The Web browser is the gateway to commercial
information services as well as the free sites on the
Internet. A commercial information service provides
access to computer-based information for a fee. In
1997, approximately 17 million people
subscribed to the top four commercial information
services: America On-Line, Compuserve, Microsoft
Network and Prodigy.
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Figure 1: Sample Home Page
The server sends the data for the Web page over the
Internet to the computer. The data includes two things:
the information the user wants to view and a set of
instructions that tells the browser how to display it. The
instructions include specifications for the colour of the
background, the size of the text, and the placement
of the graphics. Additional instructions tell the browser
what to do when the user clicks on a link. The
browser’s menu and tool bars help users navigate the
Web as they follow the links. The Back and Forward
buttons trace and retrace the users’ path
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through the links being followed from one Web page to
another. The browser stores and can display a list of
the pages being visited during each session. The
browser can also store a list of favourite sites, often
called bookmarks, to permit the user to jump directly
to the site they wish to see instead of having to enter
its URL every time.
Users can find information on the Web by using a
search engine. There are a number of Web sites that
provide search facilities, and the Internet Service
Provider will linksto these sites.
Search engine: A program that searches documents
for specified keywords and returns a list of documents
where the keywords were found.
Applications software includes programs that users
access to carry out work. This lesson examines two
applications that may be of particular use to the
student: databases and electronic mail (‘e-mail’). It
introduces key concepts related to how databases and
e-mail work.
Please remember, this lesson is not intended to provide
a comprehensive explanation of the technical details of
all applications. Other applications would be word
processing, spreadsheets and presentations.
A database is a collection of information stored on one
or several computers.
Database: A structured assembly of logically related
data designed to meet various applications but
managed independently of them. More specifically, a
database is a self-describing collection of integrated
records.A database is self-describing in that it contains,
in addition to the user’s source data, a
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description of its own structure (such as in a data
dictionary). It is the data dictionary that make data
independence possible (for example, the database
management system maps the data fields into records
and handles other similar transformation).
A database is a collection of information stored on
Data field: A space allocated for a particular item of
information. In a database, fields are the smallest units
of information you can access.
A data field contains a single piece of information (first
name, family name, ministry, employee number, salary
and so on). A collection of data fields comprise a record
such as, in this example, an employee record.
Database record: A complete set of information in a
database; records are composed of fields, each of
which contains one item of information.
A collection of records (in this case, employee records)
comprises a database. Structured databases typically
store data that describes a collection of similar entities.
‘Salaries and benefits’ is an example of an entity;
‘education/training’ is another entity. A n employee
database stores data about the employees in an
organisation. A medical database stores data for a
collection of patients. An inventory database stores
data for a collection of items stocked in a warehouse.
Data structure: A scheme for organising related
pieces of information. The basic types of structures
include: files, lists, arrays, records, trees, tables. Each
of these basic structures has many variations and
allows different operations to be performed on the
There are three basic database models.
  Hierarchical databases exhibit a branching
structure, with information arranged
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into sets and sub-sets; getting to a particular piece of
data may require going
through several vertically ordered files. An example is
the process involved in
finding a distant cousin on a family tree.
  Network databases offer many more direct
connections between files, but,
similar to hierarchies, the links are predefined and are
difficult to change or adjust.
  Object-oriented databases link self contained
entities (or objects) together.
Objects can be text, a picture, a piece of film or any
item that can be individually
selected and manipulated. This kind of database is
particularly useful for
organising large amounts of disparate information, but
they are not designed for structured numerical
The limitations found with these types of databases
explain why most organisations have turned to
relational databases. Relational databases not only
accommodate multiple views but allow new links to be
forged as needs arise. Relational databases
are powerful because they require few assumptions
about how data is related or how it
will be extracted from the database. As a result, the
same database can be viewed in
many different ways.
Relational database: A database that spreads
information across different tables while maintaining
links between them.
A relational database stores facts in tables called
relations. The only requirement is
that the information must be capable of being laid out
in rows and columns (similar to
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a list of names, addresses and phone numbers). An
example from a university might
help to illustrate the concept. In a very simplified view
of a university database, each
facet of the university’s administration would be
represented by a table containing
information within the remit of a single department.
The admissions office, for
instance, keeps track of students by ID number, name
and major field of study. The personnel office keeps
records of the department, rank, names, and social
identity numbers of the teaching staff, and so on. The
following figure shows examples of relational tables.
A relational database stores information across
different tables and connects them with links in the
Database management software is used to create and
manipulate databases. Data access software is usually
used to search databases. The data access software
understands the structure and details of the database
which means the user simply has
to enter his or her search specifications, using either a
menu, a keyword search engine,
a query language or a natural language (among
Menu: A collection of onscreen choices given to the
user to help him or her interact with a computer
Database menus are similar to those used in most
software. They are typically arranged as a hierarchy so
that after the user makes a choice at the first level of
the menu, a second series of choices appears.
Keyword searching permits access to databases
through the use of keywords.
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Keyword search engine: A program that allows a
user to search a database by an index entry that
identifies a specific record or document.
Keyword search engines are especially popular for
searching the many documents stored in a free form
database such as the World Wide Web. To use a
keyword search engine, the user types in a word and
the search engine locates areas in the database
where the word or related information can be found.
When information in a database needs to be accessed
quickly, it is usually stored as a structured database.
However, the structure in structured databases can
cause a problem for users who might not know the
format for the records in a database. One way to help
users search structured databases is by providing a
‘query by example’
user interface based on the use of a query language.
Query language: A set of command words that can be
used to direct a computer to create databases, locate
information, sort records and change the data in those
One query language is called SQL (structured query
language). The use of query language is based on
knowledge of the command word and the grammar or
syntax that will let one construct valid query sentences.
For example, the SQL command word
for finding records is SELECT. WHERE is used to specify
that only certain rows of the table are displayed. For
example, SELECT employee ID no from employee
statistics table WHERE position = ‘Manager’.
In more sophisticated systems, queries can also be
formulated in a natural language such as standard
English, French, or Japanese. In order to use the
natural language, the user is not required to learn a
query language. Queries can be straightforward such
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as: ‘What records of World War Two are available in
the archival institution’? This form of searching is still
under development although examples of its use are
spreading rapidly.
Users can ask questions of the database using a variety
of query languages, which formulate questions so that
the computer can perform operations and provide
Communicating via e-mail is rapidly becoming as
important as telephone and fax communication and
forms an important component of any office
automation system.
Electronic mail ( e- mail) : A way of sending messages
between people anywhere within an organisation or in
the world using a computer that can communicate with
another computer through a computer network. The
message or document can be viewed on a computer
screen and printed out.
E-mail is handled by a variety of software programs
such as Microsoft Outlook Express, Eudora, elm, pine
and so on. The message originator creates a message
file in the e-mail software editor. When complete, the
message is posted to a message transport system that
assumes the responsibility for delivering that message
to its recipient(s) ‘mailbox’.
To receive and read the message, the recipient runs a
software program that retrieves incoming messages,
allowing the messages to be filed, listed, forwarded or
replied to.
Generally a single user-interface program is used to
send and receive messages both locally and worldwide.
Users do not need to have the same e-mail software
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program as the person they are corresponding with.
The e-mail itself may consist of simply a message or
may carry with it attachments containing files created
in a variety of software applications, for example word
processed documents or spreadsheets.
Electronic mail is a method for communicating
messages electronically using computer networks.
The ability to send email depends on having an
Internet Service Provider and a modem, or being linked
into a larger university, government or company
Being linked into a larger network requires a user to
have a network card in the computer and access to
network cabling. There are various networking
One of the most common is ‘ethernet’.
Ethernet: A local area network (LAN) protocol that
supports data transfer. Open networks allow users to
send e-mail internally, to colleagues in the same
organisation, and externally via the Internet. Some
organisations have private networks that allow staff to
send e-mail all over the world, but not outside the
Network administrators or Internet Service Providers
will give users an email address.
This is usually in the format [email protected]. The first part
of the address before the @ sign is the individual user’s
name or identifier. The second part of the address is
split into at least two parts (sometimes more), each
part divided by a full stop or period.
This part of the address indicates which company or
university the user works for, or which ISP they are
using, or even which country they are based in.
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For example a user on America-Online would have the
address: [email protected]. A user in the British
University College London may have the email address:
[email protected]. In this address, the user has been
given the code ‘zzz999’ by the university. The rest of
the address shows that ‘ucl’ is University College
London, that it is an academic institution (‘ac’) and that
it is based in the UK (‘uk’). There are a number of
different types of email addresses, including .com, .org, and so on.
The following figure is an example of an e-mail
message received using Microsoft Outlook Express
electronic mail software that includes attachments.
Computer keyboard shortcut keys
Quick links
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Shortcut keys ABCs
Basic PC shortcut keys
F1 - F12 function keys
Top 10 keyboard shortcuts
Linux and Unix shortcut keys
Apple shortcut keys
Microsoft Windows shortcuts
Microsoft Excel shortcut keys
Microsoft Word shortcut keys
Internet Explorer shortcut keys
Microsoft FrontPage shortcut keys
Microsoft Outlook shortcut keys
Mozilla Firefox
Keyboard terms
How do I create a Windows shortcut key?
Shortcut keys ABCs
Shortcut keys help provide an easier and usually
quicker method of navigating and using computer
software programs. Shortcut keys are commonly
accessed by using the Alt (on IBM compatible
computers), command key (on Apple computers), Ctrl,
or Shift in conjunction with a single letter. The de facto
standard for listing a shortcut is listing the modifier
key, a plus symbol, and the single character. In other
words, "ALT+S" is telling you to press the Alt key and
while continuing to hold the Alt key, press the S key to
perform the shortcut.
In addition to the shortcuts listed on this page, users
can find the shortcut keys to their most popular
program by looking for underlined letters in their
menus. For example, in the picture to the right you'll
cannotice that the "F" in File has been underlined.
This means you can press the Alt key and F to access
the File menu. Note: Some programs require the user
press and hold ALT to see the underlined characters.
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Finally, as can also be seen some of the common
features such as Open (Ctrl+O) and Save (Ctrl+S)
have shortcut keys assigned to them.
As you begin to memorize shortcut keys, you'll notice
that many applications share the same shortcut keys.
We have the most commonly shared shortcut keys in
the below basic PC shortcut keys section.
Tip: Users outside the United States or users using a
foreign copy of a Microsoft Windows or Microsoft
application may not be able to get all the below
shortcut keys to perform the function listed below.
Basic PC shortcut keys
The below basic shortcut keys are a listing of shortcut
keys that will work with almost all IBM compatible
computers and software programs. It is highly
recommended that all users keep a good reference of
the below
shortcut keys or try to memorize the below keys. Doing
so will dramatically increase your productivity.
Shortcut Keys Description
Alt + F File menu options in current program.
Alt + E Edit options in current program
F1 Universal Help in almost every Windows program.
Ctrl + A Select all text.
Ctrl + F Open find window for current document or
Ctrl + X Cut selected item.
Shift + Del Cut selected item.
Ctrl + C Copy selected item.
Ctrl + Ins Copy selected item
Ctrl + V Paste
Shift + Ins Paste
Ctrl + P Print the current page or document.
Home Goes to beginning of current line.
Ctrl + Home Goes to beginning of document.
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End Goes to end of current line.
Ctrl + End Goes to end of document.
Shift + Home Highlights from current position to
beginning of line.
Shift + End Highlights from current position to end of
Ctrl + Left arrow Moves one word to the left at a time.
Ctrl + Right arrow Moves one word to the right at a
Microsoft Word shortcut keys
Below is a listing of all the major shortcut keys in Microsoft
Word. See the computer shortcut page if you are
looking for other shortcut keys used in other programs.
Shortcut Description
Ctrl + 0 Adds or removes 6pts of spacing before a paragraph.
Ctrl + A Select all contents of the page.
Ctrl + B Bold highlighted selection.
Ctrl + C Copy selected text.
Ctrl + D Open the font preferences window.
Ctrl + E Aligns the line or selected text to the center of the
Ctrl + F Open find box.
Ctrl + I Italic highlighted selection.
Ctrl + J Aligns the selected text or line to justify the screen.
Ctrl + K Insert link.
Ctrl + L Aligns the line or selected text to the left of the
Ctrl + M Indent the paragraph.
Ctrl + P Open the print window.
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Ctrl + R Aligns the line or selected text to the right of the
Ctrl + T Create a hanging indent.
Ctrl + U Underline highlighted selection.
Ctrl + V Paste.
Ctrl + X Cut selected text.
Ctrl + Y Redo the last action performed.
Ctrl + Z Undo last action.
Ctrl + Shift + L Quickly create a bullet point.
Ctrl + Shift + F Change the font.
Ctrl + Shift + > Increase selected font +1pts up to 12pt and
then increases font +2pts.
Ctrl + ] Increase selected font +1pts.
Ctrl + Shift + < Decrease selected font -1pts if 12pt or lower,
if above 12 decreases font by
Ctrl + [ Decrease selected font -1pts.
Ctrl + / + c Insert a cent sign (¢).
Ctrl + ' + <char> Insert a character with an accent (grave)
mark, where <char> is the
character you want. For example, if you wanted an accented è
you would
use Ctrl + ' + e as your shortcut key. To reverse the accent
mark use the
opposite accent mark, often on the tilde key.
Ctrl + Shift + * View or hide non printing characters.
Ctrl + <left arrow> Moves one word to the left.
Ctrl + <right arrow> Moves one word to the right.
Ctrl + <up arrow> Moves to the beginning of the line or
Ctrl + <down arrow> Moves to the end of the paragraph.
Ctrl + Del Deletes word to right of cursor.
Ctrl + Backspace Deletes word to left of cursor.
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Ctrl + End Moves the cursor to the end of the document.
Ctrl + Home Moves the cursor to the beginning of the
Ctrl + Spacebar Reset highlighted text to the default font.
Ctrl + 1 Single-space lines.
Ctrl + 2 Double-space lines.
Ctrl + 5 1.5-line spacing.
Ctrl + Alt + 1 Changes text to heading 1.
Ctrl + Alt + 2 Changes text to heading 2.
Ctrl + Alt + 3 Changes text to heading 3.
Alt + Ctrl + F2 Open new document.
Ctrl + F1 Open the Task Pane.
Ctrl + F2 Display the print preview.
Ctrl + Shift + > Increases the highlighted text size by one.
Ctrl + Shift + < Decreases the highlighted text size by one.
Ctrl + Shift + F6 Opens to another open Microsoft Word
Ctrl + Shift + F12 Prints the document.
F1 Open Help.
F4 Repeat the last action performed (Word 2000+)
F5 Open the find, replace, and go to window in Microsoft
F7 Spellcheck and grammar check selected text or document.
F12 Save as.
Shift + F3 Change the text in Microsoft Word from uppercase
to lowercase or a
capital letter at the beginning of every word.
Shift + F7 Runs a Thesaurus check on the word highlighted.
Shift + F12 Save.
Shift + Enter Create a soft break instead of a new paragraph.
Shift + Insert Paste.
Shift + Alt + D Insert the current date.
Shift + Alt + T Insert the current time.
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In addition to the above shortcut keys users can also use their
mouse as a method of quickly do something
commonly performed. Below some are examples of mouse
shortcuts Description
Click, hold,
and drag
Selects text from where you click and hold to the point you
drag and let go.
Double-click If double-click a word, selects the complete
Double-click Double-clicking on the left, center, or right of a
blank line will make the alignment of the
text left, center, or right aligned.
Double-click Double-clicking anywhere after text on a line
will set a tab stop.
Triple-click Selects the line or paragraph of the text the mouse
Ctrl + Mouse Wheel Zooms in and out of document.
48 | P a g e
Mail to us [email protected] (For Any
Suggestion,Help,Doubt,Advice.Problems Regarding Jobs)
48 | P a g e
Mail to us [email protected] (For Any
Suggestion,Help,Doubt,Advice.Problems Regarding Jobs)
48 | P a g e
Mail to us [email protected] (For Any
Suggestion,Help,Doubt,Advice.Problems Regarding Jobs)

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