I need to be able to hide certain forums when a user logs in depending on the source url. For instance, say I have a general forum with sub-forums a, b, c, and d. Now, for example, I want to set up a distinct url for a particular group that wants their own separate forum b. When they click this url, they will only be able to see their sub-forum (b) and no other sub-forums. Another group will have a url that will launch sub-forum c which will only show sub-form c. Since all forums still share the same database, any entries made in the custom b and c forums will be reflected in the general forum which still displays all 4 sub-forums.
I hope I was able to clearly state what I'm trying to do.
Any help will be greatly appreciated.