> Late at night (Twilight Zone theme here.), when I start to shut down, it says that someone else is using the computer and that if I turn it off, they might lose data. Who, I ask? Where? No answer, so I turn it off anyway. Nobody ever complains.


What you need to do is go start and log off before you turn off the computer. Nothing happens when you do this aside from that little message goes away, but if you don't want the message, you need to log off.