computer program that allows users to enter and run their software packages. The operating system allows the machine to recognize and carry out the accountant's command. Further, there are built-in routines permitting the user's software to conduct input-output operations without specifying the exact hardware configuration. The operating system normally consists of the job control program, the input/output control system, and the processing program. If a computer operates under one system, it cannot use programs designated for a different operating system.
program that controls a computer and makes it possible for users to enter and run other programs. Most computers are set up so that, when first turned on, they automatically begin running a small program supplied in read-only memory or occasionally in another form (see boot). This program in turn enables the computer to load its operating system from disk or tape.
a program that controls a computer and makes it possible for users to enter and run their own programs.
Under the control of the operating system, the computer recognizes and obeys commands typed by the user. In addition, the operating system provides built-in routines that allow the user's program to perform input-output operations without specifying the exact hardware configuration of the computer. A computer running under one operating system cannot run programs designed to be run under another operating system, even on the same computer. For articles on specific operating systems, see CP/M; Linux; Mac OS; MS-DOS; MVS; OS/2; UNIX; VM/SP; Windows (Microsoft).
