This is how it is done in the game "Fighters Anthology", from Jane's/lectronic Arts, in it's time, the "mother of all flightsims", still flown today.
[:)]
I am under the impression that in starshatter two players connect only via a dedicated server (hosted by a third party or by one of the players). In fact, there is no direct IP possibility. Tha is very sad for a 50 $ game.
Matrix games please do something quickly!!! [:-]



