As previously said on here... If you got an MCSA, you should know that making a pc member of a domain will let you log onto that domain when you press Ctrl+Alt+Del. If you don't want to be presented with the Ctrl+Alt+Del screen, just go in the GPO on the server of your LAN and disable it. Otherwise, how do you suppose your pc will know whether you wanna log onto the domain or the pc itself?