Audience response keypads aren't a new idea: Attendees are each given a small keypad with which they answer questions. They can pick yes or no, or punch in a number that correlates to choices of answers. The audience's choices are tabulated by an on-site computer, then graphically displayed on a screen as bar graphs or pie charts.
The latest generation of keypads is wireless, an improvement that has increased the cost a bit but has made them much more flexible and practical. Previousl