I have a windows 2003 domain controller and 15 windows xp pro workstations. I am having difficulty joining my PC to the domaine. With WIndows XP Pro, in order to join the domain, do you have to indetify the NetBios Name of the domain, or the DOmaine Name or the Fully Qualified domain name of the DC. The only thing that is working for me is entering the netbios name. Maybe I dont understand the difference, can someone explain ?