bah bring that copy of Linux that boots from cd to school lol.
anyway Windows Key + L logs the computer off but (tried in XP at school using Novell (or something
) . anyway when you press them keys it brings up a screen like the logon one but you can still logon to your account with all the stuff still there. ( Like in windows XP switch user)
to log back in you need to put in your username and pass ( if thats the way it works in your school
)