I am tutoring my niece (who lives in another city) in math and I'm looking for an iOS iPad app that would allow us to share our screens across the Internet. Specifically, the app would allow me to draw something on my iPad screen and she would see it on her screen. She could then make changes which would appear in real-time on my screen. It's sort of like a person-to-person chalkboard that operates over the Internet. Are there any apps like this? Right now we're limited to talking to each other via Facetime, writing equations on a piece of paper, and then holding our papers up to the camera so the other person can see it. This is very inefficient. There has to be a better way! Thanks.