Hi All: I have a question: I don't want to use mediawiki's internal user management system; instead, I want to login in as follows: I click a button in the wiki's mainpage, and it will redirect me to a external site. And after I login in the external site, it will redirect to the wiki's page with some user infomation in the URL returned. And I can get the user info by parsing the URL. And I want use this user as my current wiki user. There will be no other internal databases related with the user system. My external site does't support OpenID or other systems. So, my problem is: how I can achieve this? Do I need to modify the wiki's user management system