Can user sessions be transferred seamlessly to vBulletin?

[David Pesta]

Hello, I was wondering if functionality existed in vBulletin that allowed for users that had already logged into my website to be able to seamlessly start using vBulletin without needing to log in a second time. Somehow, the session would be checked and get carried over to the vBulletin system.

Along the same lines, could vBulletin users be created from outside of the vBulletin system? When a user creates an account on my web system, I want that user to automatically have a vBulletin account created for them without needing to create an account again for vBulletin. Creating an account again for vBulletin would be redundant.

Two questions in all:
1. Can users seamlessly be transferred to a vBulletin from an outside session?
2. Can user vBulletin accounts be created automatically from an outside script?

Thanks,
David