The operating system is (or software) most important program on a computer. To work the other programs the general-purpose computer must have an operating system. Operating systems perform basic tasks such as recognizing the keyboard connection, send the information to the screen, not lose sight of files and directories on the disk, and controlling peripheral devices such as printers, scanners, etc.
In large systems, the operating system has even greater responsibility and power, is like a traffic cop, ensures that programs and users who are working at the same time not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not have access to the system.
Guest Operating Systems
Operating systems can be classified as follows:
Multi: Allows two or more users to use their programs simultaneously. Some operating systems allow hundreds or thousands of users simultaneously.
Multiprocessor: Supports opening the same program on more than one CPU.
Multitasking: Allows multiple programs running at the same time.
Multi-leg: Allows different parts of a single program run at the same time.
Real time: Responds to input instantly. Operating systems such as DOS and UNIX, do not work in real time.
How an Operating System
Operating systems provide a software platform on which other programs, called applications, can function. Applications are programmed to operate on a particular operating system, therefore, the choice of operating system largely determines the applications that can use.
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