I am not a techy and only vaguely understand the technology you're describing, however, I do appreciate the deviousness of this PRACTICAL JOKE(sorry, hit the caps lock, I think). I had a friend who was the sys admin in a professional office. He used a program like Back Orifice and would randomly open a user's cd tray or close a program. He even changed the user's sounds to always play the Close Encounters theme. Yes, practical jokes can be taken too far, techy or not, but it is a bunch of fun watching a nervous breakdown.