Hey all, I'm working under Visual Studio .NET 2003 and have a project with multiple build configurations (Debug/Release for DirectX and OpenGL versions). I'm using a library which requires me to #define a symbol for the DirectX rendering system or a different symbol for the OpenGL system, but not both at the same time. I'm fairly sure I've seen something before in the project settings where I can define preprocessor symbols on a per-configuration basis; these are not listed as a #define in a file anywhere but are automatically defined whenever I build under that configuration. The problem is that I can't seem to find this setting! Am I blind, or dreaming? That is all.