JSI Tip 2132. How do I manage a Windows NT 4.0 domain from my Windows 2000 Pro??

You can not fully administer a Windows NT 4.0 domain from Windows 2000 Pro,
without copying Usrmgr.exe and Srvmgr.exe from the NT 4.0 domain controller,
or from the Clients\Srvtools\Winnt\<platform> folder of the Server CD-ROM.

Copy the two executables to a folder in your path.