Transparent/Semitransparent windows?

[rpxmaster]

Is there a way to make parts of your OpenGL window transparent, or even semitransparent, kind've like in 'skins'? I'm thinking about including a skinning feature in my program, but I need to know if I can do this part before I attempt it.

[nexusone]

There are some good examples on http://nehe.gamedev.net


Originally posted by rpxmaster:
Is there a way to make parts of your OpenGL window transparent, or even semitransparent, kind've like in 'skins'? I'm thinking about including a skinning feature in my program, but I need to know if I can do this part before I attempt it.