Everybody knows about AirPlay Mirroring. It lets your show your iPhone or iPad’s display to your HDTV via an Apple TV. But not everyone knows that Apple has an SDK for dual screen mirroring from iOS device to Apple TV. Yes, dual screen AirPlay! Basically, it helps to output different content on your iDevice and Apple TV. For instance, take a look at the AirWeb browser. It shows the webpages on your TV while you can use your iPhone or iPad as the touch pad and keyboard, to browse.