How must change the source code? for unified user database!

Hello, onto page http://meta.wikimedia.org/wiki/Single_login/IMSoP2#How.3F (and 2.1.1) is a little bit of info, but how/what must change now to use my mediaWiki's on my server for unified user database?

~~Please help me, thanks --FireDragon 11:16, 11 Jun 2005 (UTC)~~

Oki, I think I have found a Bug for this problem! see more on my user-page or Bug2396 at http://bugzilla.wikimedia.org/show_bug.cgi?id=2396 --FireDragon 21:00, 12 Jun 2005 (UTC)