Originally Posted by MikeOnyx
Yes, Charlie is correct. There is a sensor that detects whether the stylus is in the slot or not. If it is in the slot, it turns the wacom screen off.
I'm confused now, bacause I heard from one of the distributors that it isn't truth. He maintains that WACOM is based on the electromagnetic field and its screen switches on or off depending on a distance between the stylus and the screen. So it could work even if your stylus is in the slot and you use other stylus...