Session problem in PHP

Hi,

I work with DW-MX 2004 PHP servermodel, I have a loginpage with
username, password and levels, wich are stored in a separate table in
a mySQL DB.

DW-MX 2004 generates automaticly a session of the username
(MM_Username).
How can I make a session of the level, so that I can use this session
later on.

Thanks,

Freebeeezz