Solaris 8 / PAM

Seeing as off-topic seems to have come into fashion -

Does anyone have something like a howto for writting PAM modules for solaris 8?

Failing that for any OS? I can find a little documentation but nothing as easy to read as a HOWTO or some

sample code.

Also does anyone know of any PAM modules that implement radius authentication for solaris 8? I know I

can buy software from RSA or whoever but I would rather have readable source code ( and save the money ) if at all possible.