It worked!

had to upgrade my Kixstart and rest of my scripts (I think it was version 3.0-something before - which caused a few weird things like printers not behaving)

But everything seems happy now. Students are now restricted to one logon at at time, and in the event of a computer crash, they are locked out for 5 mins (I think I might reduce this to 2 mins)

Thanks for the help!
much appreciated.
[Smile] [Smile]