[tmatrix]

Yeah, we did have "progress".

Let me give you a bit of our setup first, this I feel is important. We have vB within an iframe inside of a Drupal page. In our Drupal install we have a module which shares login information and account creation between the two databases, keeping them in sync beautifully. Drupal needs to be in charge of this process though. So when ever the login page would show for vB, we needed instead the Drupal login page.

Our solution, which we thought was pretty slick.
1) setup .htaccess to have apache redirect any http call to the vB login url, to the Drupal login url.
2) wrote a js solely for the Drupal login page to detect if it were inside a parent frame. If so, the js would then reload the parent with the login page and no iframe.

There ya have it.

Your own mileage may vary.

Hope this helps.

Cheers Murias