If I wanted to run two XOOPS sites, on the same webserver but with different domain, could I somehow have them use the same user base.

The concept is to have two somewhat independant sites, that could have a different look and feel but part of the same 'network'. I figured since they would run on the same webserver with the same MySQL db in the backend, maybe I could share parts of the sites, including the user space.

Let me know.

Skalpa posted a way of doing this a while ago here - and it works quite well indeed