what do i do to use my hdtv as a second display to my macbook pro using airplay.

hey guys,

I was just trying to figure out how do i use my tv as a second display so as to run different apps on full screen, like one app on my mac and the other on the tv.

I tried to "use as a seperate display option" from the airplay button, it doesnt seem to help.

Appreciate if anyone could help me on this.

>> for example,

i want facetime to work in full screen on my apple tv, at the same time i am using pages, however i dont want pages to show up on my tv screen.

I know its possible but i'm not sure how i make that happen.