Any good reference docs of material script editing ?

execpt manual book, any good reference docs, webs, sites about material script editing ?

such as shader, vertex, cg.file? like the "hard coded postfilter effects" in the demo_compositer?

and I would like to know in what way the demo_compositer use the script (the way seems different from normal script.particle)

The wiki is your source for all this kind of information