Well as long as both programs are set to .reftailboa.net it should be okay.
However I never suggest installing a forum on say domain.com and classifieds on
www.domain.com. Why would someone do that?
If your logins are not integrated then you need to recheck your cookie settings as this is ALWAYS COOKIES
VB3
cookie_domain = .redtailboa.net
cookie_path = /
Classifieds
cookie_domain = .redtailboa.net
cookie_path = /
cookie_prefix = bb
VB License entered in config file NOT CUSTOMER NUMBER
If the following is followed you should be integrated