Login Via URL

I have a form that my users are filling out, when they click submit on that form I am hoping that there is a way i can use a computed URL to log them into a different database.

Can anyone tell me how I can log someone in using a url perhaps?

Subject: Login Via URL

This is not a good way to log users in as the name and password get captured in the browsers cache.

You can login via AJAX, take a look at this article

http://www.codestore.net/store.nsf/unid/BLOG-20081010