I was just wondering if anyone knows how to program an overlay for the windows operating system. I am trying to write an openGL program that will overlay text or buttons that will map to function keys. Then those commands will be relayed to windows or a program that is currently running. For example, if MSWord is running, there will be an overlay button with F1 on it and by clicking on that button, help will start.

I would not use OpenGL for what you describe. Just normal Windows programming should to the trick.

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