:rambo: Thank you for the good suggestion, Erwin. Was worth a try--but no, doesn't work.
Why did you say, "Leave the field blank..."? It was blank before. The idea, I gather, was to extend the cookie activity to cover all levels of
www.forumdale.com --- rather than just
www.forumdale.com/forums/ --- thereby working with the frame that was at the higher level... Well anyway, I tried
.forumdale
.com, both with and without the extra dot--also I tried putting my index.html frame inside /forums/ and even /forums/admin/ ---no success.
Meanwhile, I think
maybe I have figured a workable procedure. I can replace the standard log-in page with a pop-up <target="_blank"> link to a log-in page. So log-ins will occur OUTSIDE the frame---users then are prompted to "close this window" and return to the frame, all logged-in... well I tested this theory and so far, it works!
This also (maybe) indicates why your idea did not work. The problem is not "recognizing the domain level of the frame...." The problem is that for some reason (???

???) cookies can not "see" anything that goes on inside the frame.... no matter what.
:rambo: :rambo: Well, I also tried 2 other ideas: naming the frame index.php instead of index.html. AND (same thing actually) replacing the entire forumhome template with the frame index.html. No luck either way... Like I say, it seems the cookies just won't look inside a frame...
I have come across a few forums that have a pop-up log-in window. Well, I guess this is the reason...
...but there might be a better way. Any more suggestions still are welcome...