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"GGPO, short for “Good Game, Peace Out” is a networking library written by Tony Cannon (of shoryuken.com and Evo fame), and it’s what Skullgirls uses for online play. I personally believe it is the future of playing fighting games online, but some players have been complaining about the online experience in the recently released Street Fighter 3: Third Strike Online Edition, which also uses GGPO."