NET COMPUTER adds or deletes computers from a domain database. This command is available only on Windows NT Servers. \computername ...

NET COMPUTER adds or deletes computers from a domain database. This   command is available only on Windows NT Servers.  \\computername    Specifies the computer to add or delete from                   the domain. /ADD              Adds the specified computer to the domain. /DEL              Removes the specified computer from the domain.