What is used in Quake III aren't shaders. Your card doesn't support shaders. BUT you can accomplish all effects quake III has (afaik). 3dgs doesn't have an own shader language. Why should it if it uses DirectX? Anyway even if you have an old card (mine is a gf2 mx400 so also no support of shaders) you can do a lot with a6 com's "material" because it also supports "fixed functions" which are on your graphic card - such as Dot3 bumpmapping, environment mapping, embm, multitexturing etc.