i just got an unexpected window saying that someone's iPod wanted to pair with my iMac via Bluetooth, with the PIN number. i said no, of course. but it's definitely weirding me out. there was nobody outside of this building nor in the hallway. how far does Bluetooth reach? Would it go through walls? is it possible to stealthily connect to a computer via bluetooth? is there a way to see everything that's connected to my mac, not just bluetooth but all types of connections?