why is 'gnatsd.user_access' pointing at...

Hi All

I'm new to gnats. I 'apt-gOt installED' version 4.1.0 on our Debian 
(sarge) system.

Just a quick question - why is gnatsd.user_access pointing to a particular 
instance of a database (in this case the 'default' database)?

    gnatsd.user_access -> /var/lib/gnats/gnats-db/gnats-adm/gnatsd.user_access

So if we work with multpile databases, how would I control user access on an 
individual database-by-database basis?

Thx Attila