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Thanks both for your reply.
We can't use LDAP at this moment, as we can't touch one of the sites due to bureaucratic reasons. I'll have to think in a doggy dirty poor solution, as the "untouchable site" uses Moodle, not XOOPS, but they allow me to store my custom PHP scripts in Moodle's server.
I think this gonna be a real piss-off.
Anyway, pemen, we'll talk about LDAP and OpenID some day.