English word

A screen shot from the
Windows XP operating
system displays icons
and other images typical
of the graphical user
interface (GUI) that
makes computers easy to
use. With a GUI, a
computer user can easily
execute commands by
clicking on pictures,
words, or icons with a
pointing device known as
a mouse.
1. In computer science,
operating system is the
basic software that
controls a computer.
2. Is a set of programs that
interface between the
user, applications
program and the
computer( translates
commands into machine
code that the computer
understands)
Is a set of programs
that interface
between the user,
applications program
and the computer(
translates
commands into
machine code that
the computer
understands)
The OS has three major
functions:
It coordinates and
manipulates computer
hardware, such as computer
memory, printers, disks,
keyboard, mouse, and
monitor;
It organizes files on a
variety of storage media,
such as floppy disk, hard
drive, compact disc, digital
video disc, and tape;
And it manages hardware
errors and the loss of data
It organizes files on a variety of
storage media, such as floppy
disk, hard drive, compact disc,
digital video disc, and tape;
And it manages hardware
errors and the loss of data
Control different computer
processes, such as running a
spreadsheet program or
accessing information from the
computer's memory.
One important process is
interpreting commands,
enabling the user to
communicate with the
computer.
Is either single-tasking or
multitasking. The more
primitive single-tasking
operating systems can run
only one process at a time. For
instance, when the computer is
printing a document, it cannot
start another process or
respond to new commands
until the printing is completed.
All modern OSs are
multitasking and can run
several processes
simultaneously
OS commonly found on
personal computers include
UNIX, Macintosh OS, and
Windows.
• UNIX, developed in 1969
at AT&T Bell
Laboratories, is a popular
operating system among
academic computer
users. Its popularity is
due in large part to the
growth of the
interconnected computer
network known as the
Internet. Software for the
Internet was initially
designed for computers
that ran UNIX.
Variations of UNIX include
SunOS (distributed by SUN
Microsystems, Inc.), Xenix
(distributed by Microsoft
Corporation), and Linux
(available for download free of
charge and distributed
commercially by companies
such as Red Hat, Inc


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