Grouper Users - Open Discussion List

Hi,

I'm new to grouper. I recently installed v1.5.3 with ldap authentication. 
Everything is working fine. But recently I wanted to create a new grouptype 
"unixgroup" with automatically generated gidnumbers, like it is described in 
one of the mailing list topics. The grouptype was no problem, but I have 
absolutely no idea how to define a hook and have it executed when a new group 
is created.
I only found some hints in the 1.4.2 documentation, but you have to be 
familiar with programming the grouper API to understand anything. The chapter 
called "Getting started with hooks" is not very explanatory.

Apart from my feedback, can someone give me any hints regarding unixgroups?

Best wishes,
Dirk