Possible to use vBulletin over multiple domains?

[zachb]

I want to use one user database over 4 different domains - is this possible?

I want to use a single installation (if possible)
I want to use the vB CMS for each domain, as well. (Meaning, xxx.com and yyy.com will feature their own CMSs, while xxx.com/forums and yyy.com/forums will house the forums)
I want only certain forums to be displayed when on a certain domain. (ex: only xxx forums on xxx.com, yyy forums at yyy.com).

I will have enough licenses to do this, by the way. I understand I will need a new license for each domain.

Is this even possible? Thanks.