Auto register and auto login

[cjoh44]

We want to run vbulletin as a secure message board behind our extranet site, we currently use Netegrity siteminder for security. We need two things:

1. When a user goes from our secure site (non-php) to vbulletin, I want to auto login them into the message board by passing Vbulletin the login information via URL or cookie. Is this possible or does anyone know of a hack.

2. Along with the above, if a person is not registered already, I want to offer them a way to either auto register with information passed in a cookie or URL string or if that doesn't work, have them do a quick registration.

Any suggestions or links to hacks would be very helpful.

Thanks,
Chris