[MPlayer-DOCS] SDK?

Hello! I am trying to make a third-party app, that would be able to control the behavior of MPlayer... I mean pause/stop/start the movie, jump fwd-bwd, set volume, etc... I haven't found any way to do this, maybe you could help me out with an SDK, or something? I am currently working on the windows version, but I am thinking of doing it cross-platform, if it is possible (working in c#). Thanks in advance, Vandra Ákos P.S. May I write in hungarian?