s! domain = domain server = server Un-registers the given Windows computer as a Remote Access server in the Active Directory ...

%1!s! [ [domain = ] domain [server = ] server ]                                                                                            Un-registers the given Windows computer as a Remote Access              server in the Active Directory of the given domain.                                                                                             server - the computer name of the computer to be unregistered as                 a Remote Access server.  If no server is specified the                  computer from which the command is issued is assumed.                                                                                  domain - the domain in which the given server should be                          unregistered.  If no domain is provided, the primary                    domain of the computer from which the command is                        issued is assumed.