I'm not quite sure what you mean benracer.
To log into the members area of the site, the session variables are set to the username/password, as normal in php user authentication.
Then they access the forum (I'll be using SMF forum and I'm not sure I want to figure out how to use the session variables with SMF's templates - surely that would be a big job and probably get broken with forum software updates?)
So instead, it's easier to put the forum in a directory and password protect that directory with htaccess.
I just want to make it as seamless as possible for the user by stopping the pop up box for the htaccess.
Is there a better way of doing this?