Forum Multiple sites
 

I'm not questioning if I need multiple licenses - I'll work that out with support and buy more if I do.

I want to know if this is possible.

I want to have what appears to be separate sites all on the same domain with the same user log in for all sites.
I'd like each site to have its own "New Posts" at a minimum. If needed I would replace the entire menu with one that has a custom "New Posts" specific to that section.
I'd like to be able to have separate categories in each section.

Essentially:
www.mydomain.com/forumA
www.mydomain.com/forumB
www.mydomain.com/forumC

Is this possible using one forum install?
If not, is it possible to install multiple instances (again I'll buy the licenses) and have one log in?