microcosm

I want the workstation ion the teachers desk only to allow logons from staff not students. How do I do this please. WIndows Server 2003 and XP Pro on the desktops. Thank you Microcosm

Actually after reading the replies I am starting to think that the proposal from SMT is not a good idea. Thanks anyway.

I have been asked to provide 20 laptops to loan to students the idea is they keep them and are able to take them home. They will run Windows XP and Office 2003 . Any suggestions as to a suitably tough but cheap models/makes from you experience of this sort of use.