Melt two databases

Hello I own 2 vbulletin forums I want to ask how can i do that the users must have the same account to both forums, so they must register only in one them... so what can i do with the database.. the sites are at the same server with do different domain..

thank you

[Dismounted]

There are a few ways to tackle this, none easy. You can have one database, and change the display of forums depending on domain, or have two instances and "bridge" them with a script. Keep in mind that it does require 2 vBulletin licenses either way.

yes i have two licenses, but where can i find this script?

[Dismounted]

There is none available, you will need to hire a coder, or do it yourself.