How can I draw over a full screen application

Question

I want to make a program to display information while I'm in another full screen application. Something like: show what song is playing(from Winamp) while in Starcraft II.

How would I got about doing that?

Answer 1

I would start by creating a new window with the topmost flag set. I think that will do what you want. You might have to manually move that window to the top of the topmost z order with a call to SetWindowPos. (SetWindowPos is a win32 call, but you can pInvoke it from C# if needed.)