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  Section 2.14, Vertex Programs The conventional GL vertex transformation model described in sections 2.10 through 2.13 is a configurable but essentially hardwired sequence of pervertex computations based on a canonical set of pervertex parameters and vertex transformation related state such as transformation matrices, lighting parameters, and texture coordinate generation parameters. 
  If a vertex attribute binding matches "vertex.color" or "vertex.color.primary", the "x", "y", "z", and "w" components of the vertex attribute variable are filled with the "r", "g", "b", and "a" components, respectively, of the vertex color. 
  If a vertex attribute binding matches "vertex.color.secondary", the "x", "y", "z", and "w" components of the vertex attribute variable are filled with the "r", "g", "b", and "a" components, respectively, of the vertex secondary color. 
 oss.sgi.com /projects/oglsample/registry/ARB/vertex_program.txt (13706 words) 
