Assuming they have a reasonably current version of Windows Media Player, you can pass command arguments to do things like fullscreen.  The links below should be helpful. You may have to test it and possibly use BudAPI or similar to find out what version of WMP they're running and the location.  Microsoft may have some tips on detecting the player version as well.  Otherwise you could just use BudAPI's baFindApp(".mpg") to get the player name & path, then something like:

JumpOut("C:\Program Files\Windows Media Player\mplayer2.exe /fullscreen", "D:\movie.mpg")

As I said more info at the links below, good luck.


http://support.microsoft.com/default.aspx?scid=http://s...

http://msdn.microsoft.com/library/default.asp?url=/libr...