How do you setup a Windows NT Workstation so that you can log into a NT Network domain and still get all "Administrator" level access to the NT Workstation your using?

I can do anything on my local NT Workstation while logged on to the NT domain but another computer with same setup can't even install a program unless logged in with default "Administrator" account. The person that setup my computer isn't sharing his secret on how he was able to set this up on my computer. I'm a programmer, not a network guy.

TIA.