I want to install 2 forums (2.0 RC 2) with 1 database by using different table-prefixes.

I am investigating a similar solution, but with closer relation between the two forums. In addition to sharing the database, I was wondering if parts of the database can also be shared between the forums. Of course the two forums will have different session cookies and posting entries, but is it possible to share the user tables of the two forums? So if one registers on one of the forums, he is also automatically registered on the other forum. Technically, I think this is possible by using the right table prefixes, but are there still issues which will give problems in the share?

Otto