Numbers after airplay device names
I work at a school where there is an AppleTV hooked up to the projector in every room. That means about 25 airplay devices. Teachers use iPad mirroring and it works great. The only minor inconvience is that you see all 25 devices on the iPad when you select airplay - you just have to select your own room. I'm pretty sure there is no way to filter this list - true? Often there is a number following the device name and the numbers don't make much sense (e.g. Science Lab (132)). Can anyone tell me what these numbers mean? Just curious. Thanks!
Apple TV (2nd generation)