Some kind of a program is required to start and runs basic operations, which facilitate the installation of operating system that run the other applications. The fundamental activity of Operating systems is to monitor the keyboard input data, resulting perform basic tasks, such as recognizing input from the keyboard, display screen gets the output.	Product Code: OS100 Price: Rs. 5000

Operating systems ensures that there is no intervention in the applications that are processed simultaneously. Security is enhanced in such away so that authorized people can only access the system.

They are categorized as multi-user, multiprocessing, multitasking, and multithreading. More than two users have the facility to undertake the tasks at a time in multi-user. In multiprocessing task, a program can be processed in 2 or more central processing unit. Coincidentally 2 or more applications are accessed in multitasking process.

In multithreading operation, various portions of the same program are coincidentally processed. More than thousand users are given the facility to perform tasks. In real time operation, instant response to the input signal is achieved. There are other operating systems like DOS and UNIX do not come under the real time category.

Application programs are operated with the help of operating system. These application programs are given the command to operate on the operating system The operation systems that is familiar with the people such as DOS, OS/2, and Windows, and Linux.

DOS and UNIX come under the command user interface type, whereas Windows is covered under the graphic user interface. Among the operating systems available, UNIX has more security by which one cannot enter in to the system with out the authorization.

Some of the other command user interface operating systems like Adaptive Server Enterprise, Red Hat Linux, GNU, and Fire starter. Few of the graphic user interface operating system such as Windows 95, Windows XP Professional, Windows Server and so on.