Hello! Learning about Mac's possibilities, I found out about AirPlay function. Correct me if I'm wrong, but: 1) AirPlay allows to project your desktop to Apple TV? 2) AirPlay can't be used to hack into Mac and browse files or affect system? No one can use AirPlay to get in from outside? But can someone break in to see my desktop? 3) You need Apple TV to display desktop on TV screen? 4) How to make sure AirPlay is disabled while not using it? I rather not accidentally show my desktop on someone's screen?