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In-game drawing

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Hi. I want to use a technique that I have seen in programs like Xfire or Steam, something like this: example #1, example #2, example #3. As you can see in the screenshot, the program draws things in the screen at the same time that the game is running (the chat window is from X-Fire, not from the game). I have been Googling a long time but I don't find any documentation about how to do this. I want to do this in a game made using OpenGL (Quake III Arena), OS: Windows. Any ideas? Thanks. [Edited by - Spyro- on July 29, 2008 6:07:11 AM]

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This may help you: http://www.gamedev.net/community/forums/topic.asp?topic_id=359794

However it uses D3D, i don't even know if api hooking is possible with OpenGL.

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