Bertair, its necessary for the developer of the app to integrate Air Play in their app (Apple doesn't automatically do this thought with Ipad 2 it should be mirrored after IOS5). If it is available you will generally see the Air Play icon in the bottom right. You need to choose the Apple Tv--your choice will be Apple Tv or Ipad if those are the two devices you are using. Check your developers site to see if they have added Air Play to the app.
Diane
Diane