Remote admin questions?

I need a link or some name for remote admin a cpu. Im over at a internet cafe and we would like one cpu to control the others (Like the server can look into what one is doing, then can also shut down the cpu, etc) We do NOT need warez copies! This must be legal, I just need to know what is a good thing to use. If you have any insight please let me know. (I post this before I look myself) Also anyone know off the top of their head how to disable 98 making new users?

Like say we have 2 users made (Admin and user) we DONT want them to make NEW users by simply typing a new name. I already locked out the "esc" logon, so they MUST logon. Just need to prevent them from making new usernames. Hell I wish this was Novell or NT but sadly I had to work with what I had over there....98....