I was (re) installing the HP drivers on my iMac (no drivers for it come w/ OS X Panther) and so then it says "No other applications can be on for this process" and you press a button like "Proceed" and then it closes everything but Finder. Would someone be able to integrate this sort of a feature into a program to create a somewhat virus that would just plant itself to start on login and it wouldn't allow you to run anything?