Writing a netgraph module

[Squigly]

Newbie question, sorry..

I want to develop netgraph module (something simple at first, but the
intention
is to write a full-fledged-real-world-bla-bla system).

Problem is, I can't seem to find anything regarding the development
process of
a netgraph module.

Google/Handbook/Forums didn't give much. I poked the code a bit (both
for netgraph subsystem and some modules),
but I do need something more basic to start with.

Appriciate your help.

Squigly.
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