opengl / graphic api UI question

[Dark_Omen]

I am trying to develop a In-Game Music Controller, controls music players for gamers, but I am having trouble figuring out how I can make a UI that would come up over the game so that a person could use it without having to minimize it (sort of like xfire). Does anybody know where I can get started, or if anyone has any information on how to make GUI's using a graphic api in c# that would be great.
Thanks!

[tayspen]

This isn't open gl. But it is DirectX, this shows how to overlay text in a game. Hope this helps :).

http://www.gamedev.net/community/forums/topic.asp?topic_id=367591

[Dark_Omen]

OK, yeah that is exactly the type of thing I was looking for, thanks.