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<< I'm kinda confused. If nt/2000 does not use dos, why a dos command prompt in them? I mean, what would it do? >>
Because people want a DOS prompt, so MS includes a DOS emulator. Personally I use it for tracert, ping, and other network diagnostics. >>
And also because the NT series originated from BSD code, I thought. Not to mention that if your GUI is bonkers you can boot to a command prompt.