I have set the Guests permission in my forum to "No Access". So, right now, they cannot access directly any forum or post, nor can they see in forums when they're in the index page. Is it possible to have the forums and sub-forums visible for guests in the index page but not accessible (ie, if they try to enter in any given forum, they go to the "Register" page)? That is, any user that's not logged in can see what exists in my forum, but has to register to access it.
EDIT: Found it in the "Group Forum Permissions".