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DOS

DOS: 1. Disk Operating System. The original command line based operating system used on IBM personal computers and compatibles. Technically PC-DOS refers to the version of DOS used on IBM computers and MS-DOS the version of DOS used on compatible clones from other manufacturers. Both PC-DOS and MS-DOS were written by Microsoft and were essentially identical.
DOS predates Windows. Earlier versions of Windows (notably Windows 9x) provided the option to restart in "DOS mode". Current Windows versions still support a "Command Prompt", which provides a DOS like interface.; 2. Denial of Service (attack).

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