I needed to launch a movie player based on the format of the movie I was playing. I have a collection of DVD, Blu-ray and HDDVD movies. I cannot run Total Media Theater(It can play both Blu-ray and HDDVD) because it did not support Vista 64. So in order to play the latest Blu-ray titles I use PDVD8 and for the HDDVD tiltles I use PDVD 7.3. I did not want multiple play buttons so I came up with a way to use a specific player based on the format of the movie. You cna see what I did here in a mini-tutorial http://sites.google.com/site/lpgshtpc/Home/xlobby---setup-of-multiple-video-players
Thanks to all those who helped me figure this out.
Larry