Lock workstation when cable disconneted

In XP, you get a notification in the systray area to inform you when a network cable is plugged in or unplugged, so the principle is there!

I'm sure someone has a solution, and I would also like to hear it, but I can also see a downside to this. You would need to be able to toggle the function! I have a 'portable' computer in a simulator system which has no CD-R or floppy drive, so to transfer any data on or off the system, I have to plug it into a spare port on a hub and network to my server. It wouldn't be much use as a standalone system if it locked itself down in the absence of a network connection!

If your work station is part of a network (which I assume it is) then when the cable is unplug then they can't logon to the domain thus the computer is lock only the administrator can logon. You also have to set the local settings to deny logon locally and just assign the policy to the one you don't want to logon locally