I''m new to network programming, so which one of those public ''systems'' is better? -Hans

Obviously openplay It''s a very multiplatform solution.

Directplay is Windows specific (heck, it only exists on Windows) and has the nasty sideeffect that if you should choose to port the game, only Windows users can play with Windows users. (unless you are willing to put some extra effort into other platform ports and basically rewrite your version of DirectPlay.