Are "GL_EXT_secondary_color" & "GL_EXT_texture_env_combine" compatible?

I have received conflicting feedback about whether the secondary color array can be specified by the texture combiner extension. Is this possible, and how is it done?

Thank you.

They are compatible.
If you are asking if you can specify the secondary color in your tex combine code, then I think the answer is no.
Look at page 189 (203 in Adobe Reader) of the GL 2.1 spec.
No way to specify the secondary color.