How can I mirror one Mac's screen to another? Here's the situation: I have a MacBook Air that I'd like to mirror the display (and audio) of to a Mac Mini, via WiFi.

It is completely possible to mirror the MacBook Air to an Apple TV (using "AirPlay Mirroring"), but I'd like to know if it's possible to do the same thing between two Macs, even if it means using third-party software.

More detail: the Mac Mini is connected to a screen only, there's no mouse &amp; keyboard attached, so a solution that involves manually starting some software on it (e.g. Remote Desktop) is no good; I'd like something that just sits quietly and takes over the screen when it receives something from the MacBook.
You can install the program "AirServer" on the Mac Mini to be able to AirPlay the display directly to it: 

http://www.airserver.com/Download