I would like to see if there is a possibility of streaming a full screen app or a space onto Apple TV with MacOS mountain lion. The implication of this is that I could stream for example a tech talk on to my TV while I browse on another screen space. I believe that mirroring would just show the stuff that I see on my screen.
closed as off topic by Nathan Greenstein♦ Jul 18 '12 at 17:43
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Unless a hack will be possible or Apple will have an AirPlay API for someone to make an application that makes the Apple TV a 2nd display it does not look possible with the advertised OS X Mountain Lion feature AirPlay Mirroring, since it will only allow mirroring of what is on your screen, probably only your primary screen too.