using the GL_EXT_fog_coord extension

I’m wondering if anyone knows where I may find sample code for the extension GL_EXT_fog_coord, and the related function, glFogCoordf. I’ve looked through this site, NeHe, and Nate’s Programming site, and have had no luck. Any help here would be much appreciated.

i done one a little while ago
also just uploaded (5mins ago) an example of the nv tex env combine4 extension.

Thanks! It works great!