MLB 2K9 Game is on windows(XP,Vista). You can download MLB 2K9 demo in my blog. and so You must have one computer on windows and downloaded file in my blog(will write) and App. If you finished downloads in the written, run atteching file program. You must connecting network both. You just "find server" click in App or You write IP Address of computer installed MLB 2K9 in App.