I know it is a dumb question but I need an expert to ease my mind

I have a SBS 2003. I has user accounts on it with just User rights. If I setup a WinXP workstation, and add join the domain. Then add a user on the workstation using the domain I set up on the server AND giving the user Administrator rights. The user rights on the server will over ride those of the workstation so they cannot perform Administrative tasks on the server, Right?????