Session management implementation in mod_python

Hi all,
I am in the process of writing a twisted python xmlrpc server wherein I
need some session management functionality that I have to write on my
own. Since I have used mod_python for long, I thought I could use the
ideas from mod_python's Session.py. But when I tried looking into the
Session.py code, I couldn't understand a lot of things due to my
insufficient knowledge. Can anyone help me in understanding the brief
overview of how it is done?

Regards,
Guruprasad