Windows NT TSE was a special version of NT that had
terminal services built in. Windows 2000 Pro doesn't have
this ability though, you'll need Windows 2000 server or
above.
NT 4.0, Terminal Server Edition is a separate product, so Terminal
Services is not a service that you can install on a normal NT 4.0
Server, you'll have to install TSE from scratch.
Windows 2000 Pro has no TS or Remote Desktop functionality at all
(except that it can be a client).
If you are looking for remote administration features, you'll have to
use PCanywhere or VNC on these systems.