iPad Gestures or How to Toggle

So a textbook publisher for my students' e-books has asked me to try out their new iPad e-book to see what my students think of it.  To do so they are willing to give us 30 iPads for a month of use.  Actually other than completely changing the way I teach and my students have been learning this essentially is just an opportunity for us to learn since they aren't giving the school anything!! Initially I was hesitant, but since I love learning new things, I think I will accept the offer despite the shortcomings.  Already one nice thing I have figured out is that there are gestures you can do to more easily maneuver between documents.  So if that is you, then this might be helpful as well as this to turn on the gestures.