Sharing userbase
 

Hi guys,

I'm starting up a second site and want to use vBulletin 4 on it... The site will be affiliated with the first site and I would like to set it up so that there's only 1 user base, people who register on either site should thus have the same account used on both sites...

- Existing accounts can be used on the new sites
- Sites created on site one are valid for site two...

Can this be done between vBulletin 3.8 and 4.0?