Here are a few threads to check out:

http://www.gossamer-threads.com/scripts/forum/resources/Forum12/HTML/002725.html

which explains what O'Grain has setup and how it functions,
and

http://www.gossamer-threads.com/scripts/forum/resources/Forum12/HTML/002601.html

which i think is the main discussion of the code?

I'm sure if one of the above doesn't answer your question, you could do a search for "O'Grain" to find the other posts. There are a few of them .. if I remember correctly.

Hope this helps



Unoffical DBMan FAQ
http://webmagic.hypermart.net/dbman/