This is a video of a past exercise conducted by Placeways, the developers of CommunityViz:
http://www.youtube.com/watch?v=x-zJcGR3raU. There is no audio with the video, nor any explanation. Looking at this video and the slides below you should get a pretty good fell for the set up.
In the attachment below are some powerpoint slides showing some screen shots of the CHARM model. Be sure to look at the notes for explanations.