The only thing I know related to this, has been done by the Drupal dev team some years ago. It's not your average hack. It's really big and would probably involve rewriting vB's authentication system.
Digma, that's another story. It's the same site, under the same domain, probably on the same db. A lot of software can use vB's member system but it's built the other way around, from 3rd party to vB and not from vB to 3rd party software.
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