This program allows you to take anything that is showing on your handheld devices and display it up on a screen. Just like the function of AirPlay on an AppleTV, it shows everything that you can see. It is much cheaper than an AppleTV and requires no chords. Both audio and video will be reflected.
This app allows the teacher to notate music by hand, and then see it notated digitally right above the handwritten part. The best part is that the app will then play the music back and allow the classroom to hear what it is supposed to sound like.