5.MS-DOS -short for Microsoft Disk Operating System) is an operating system for x86-based personal computers. It was the most commonly used member of the DOS family of operating systems,
6.MULTITASKING-The ability to execute more than one task at the same time, a task being a program. The terms multitasking and multiprocessing are often used interchangeably,
7.NOS-Set of programs that, as a part of an operating system (OS), provide file and print services, directory services, and security to computers connected via a network.
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