Pixel grouping is the ability to control each section as a pixel. It let's you basically turn a stack of them into a low res LED video wall, especially if you are using a media server of some sort (Catalyst, Axion, etc). That is not to say you can't take the time and program the same effect without a media server, it would just take forever. The effect would basically look like this: http://www.youtube.com/watch?v...2qRI&feature=related