There has been a lot of talk about disruptive technologies: how to teach around and against them. There are also attempts to integrate them into live class discussions. The
backchannel is that lively student discussion taking place with laptops and mobile devices while you are lecturing. The discussion is invisible to the lecturer. One easy way to interact with the backchannel is
TodaysMeet. It allows instructors to quickly set up a live web discussion room to gather questions and comments from the students.