Originally Posted by ThinIce

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Wallhacks
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A wall hack does not mess with the server, I'd presume you all know that. A wallhack is simply a tweaked opengl32.dll driver that will allow you to see through the walls.
IT WILL NOT ALLOW YOU TO SHOOT THROUGH WALLS.
The server is running the map, and it analyzes everything that physically happens on the map. No matter what you do, you will not be able to shoot through a wall. The opengl32 lets you see through, but the server is running the physical boundaries and data.