I'm sorry to have to dispute SoulRider, but there is no true DOS environment in Win2K. Unlike Win98 (which is actually running on top of DOS), this is not the case with Win2K. What you are actually seeing is a 32-bit DOS emulator called cmd.exe. Cmd.exe is what you are running when you choose "Safe Mode with Command Prompt" from Advanced startup options. Also when you lauch DOS programs from within Win2k, they are actually run in a virtual DOS machine.
Although what you see looks like DOS and (for the most part) acts like DOS, it isn't true DOS.