The Microsoft Terminal Server support page is here.

How does an organization keep NT Admins from performing non-admin tasks when logged on with admin access rights? The potential for damage and security exposures given the proliferation of Trojans and NT oriented viruses is significant. One good solution involves removing admin tools from the admin workstation and making them available via Terminal Server. NT admins log into their workstations using normal user accounts.

ins and outs of combining Microsoft's Terminal Server Edition and Citrix's MetaFrame products