Well it does have to do with the Operating System (OS) but is not limited to the Disk Operating System (DOS). DOS is a much misused term these days. The CMD prompt is not really a DOS prompt but I have been as guilty as everyone else in calling it that.

DOS was the underlying Operating System for all Windows versions except NT/2K/XP/2K3.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.