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Shutdown.exe is available in the Microsoft Windows 2000 Resource Kit. It is a command-line tool that you can use to shut down or restart a local or remote computer that is running Windows 2000 or Windows NT 4.0. If you want to schedule a computer to shut down and restart at a specific time, use Shutdown.exe in combination with the at command or Task Scheduler.
See: How To Use the Remote Shutdown Tool to Shut Down and Restart a Computer in Windows 2000 [support.microsoft.com] for more details.