Your subject line, UDP, implies you're trying to access our UDP stream. This is a VRPN (
www.vrpn.org) data stream and you'll have to go to their website and download their opensource project to determine this. PPT currently implements version 6.06 of VRPN.
If you're interesting in access the serial version of the data, then go to the WorldViz PPT download site:
http://www.worldviz.com/download/index.php?id=16