QuakeC²

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Hmm, well if you want to learn QuakeC just download the entire QuakeC source code here and use a compiler like Microsoft Visual Studio 3.0 or higher.  Add all the .c files included in the source and the single .def file, then compile them all into Gamex86.dll which should be around 364k, and put the dll in its own subdirectory under quake.  Launch quake with the +game <gamedirectorynamehere> and you can play your modification.  Its pretty easy, and since all of the quake C Code is there as it is, all you really need to do is modify source, instead of making new..VERY COOL!