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Thursday, February 9, 2012

Explain Types of User Interface

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What is a User Interface? Explain its types.

User Interface


User Interface is the set of items on screen to interact with the computer. A user interacts and uses computer with the help of these items. For example, Windows Desktop is an example of user interface. Similarly Dos Prompt is also an example of user interface.

Types of User Interface

There are two main types of user interface:
1) Graphical user interface (GUI)
2) Command line user interface (CLI)

1) Graphical User Interface

Graphical user interface or GUI provides different graphical items like windows, menus, tool bars and icons etc. A mouse or any other pointing device is used to work with these items. Commonly we select different commands from menu or toolbar with the help of mouse. We need not to type commands. We can double click on a file or folder to open it. We can double click on a shortcut to open a program. GUI is very easy to interact the computer.
All versions of Windows, Macintosh, OS/2 and some versions of Unix and Linux provide GUI.




Advantages of GUI:

a) Easy to learn: It is very easy to learn even for beginners or ediots :D
b) Easy to use: GUI based systems are very easy to use becaus of icons, shortcuts, toolbars and menues etc.
c) Use of mouse: Since, we use mouse to select any command from a menue or toolbar, so we feel easier to work on computer.
d) Less typing: There is a very less need of typing commands in a GUI based software. Mostly, you are to point and select commands with mouse.
e) No need to memorize syntax of commands: Syntax is the way of writing that is typing a command so that computer can understand and execute it. Since, in GUI we use mouse button clicks, we need not to memorize command syntax.

2) Command line user interface (CLI)




A command-line interface provides a prompt / place where user types commands for execution. CLI interface is difficult to learn and use. We have to memorize commands. Operating system will not execute the command if there is a small error in typing the command. Dos and some versions of UNIX and Linux provide command-line interface. CLI is character based or textual interface.
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Friday, February 3, 2012

Different Types Of Operating Systems

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Q. Explain different types of operating system

Following are different types of operating system




1) Single User Operating system

An operating system that allows a single person to use or access a computer at a time is called single user operating system. For example, DOS and Windows 95 are single user operating systems.

2) Multiuser Operating System

An operating system that allows more than one user to access a computer at a time is called multi user operating system. For example Unix, Linux, Windows 2000 server



3) Single Tasking operating system

An operating system that allows the user to perform only one task at a time is called single tasking operating system. For example, DOS is a single tasking operating system. In DOS, you can type and execute only one instruction at a time. you cannot use another command untill the first command is completed.



4) Multi Tasking operating system


An operating system that allows the user to perform more than one tasks at a time is called single tasking operating system. For example Windows, Unix, Linux are multi tasking operating systems. In MS Windows we can perform many tasks at the same time. For example, we can type some letter in MS Word while listening music in an audio player software at the same time.



5) Stand Alone operating system

An operating system that works on a desktop or notebook computer is called standalone operating system, for example DOS, Windows 2000 professional etc

6) Client operating system

A stand-alone operating system that works with a network operating system is called client operating system. e.g. Windows 2000 professional, Windows NT workstation

7) Network operating system


An operating system that supports network is called network operating system. It normally works on a server. Some examples of network operating system are Windows NT Server, Windows 2000 Server, UNIX, and Linux etc.

8) Real Time operating system


A real time operating system is a very fast operating system. It responds to a certain input extremely quickly. Real time operating systems are needed to run medical diagnostic devices, machinery and industrial systems.

9) Time sharing operating system


A time sharing operating system is an operating system in which many users can execute their tasks nearly simultaneously. Operating system allocates a very small time period to each task. All tasks share CPU time. CPU executes each task for a very small time period turn by turn. CPU is so fast that all users think that CPU is doing their task.
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