Remote logon to Terminal Server using old PC's.

I want to log on to a Windows Server 2003 running Terminal services with old PC's.
The idea is to utilise old PC's that are not capable of running XP etc. Some of these PC's cannot run KDE as there is not enough memory.

It must also be foolproof because the dumb terminals will be used at a school. IE only the login screen shows. they will not use any of the Applications on the CD. The old PC's will only have a CD rom and maybe a stiffy. All these PC's are currently running MS Win 98/95.

How can I create a startup disk that will logon remotely without starting the GUI?