I added the "Notify" check mark to this my original post to this thread.
For an experiment, I also flagged the Selling Counterpoint thread by clicking the Notfy button at the bottom.
When D & D replied to that thread, I received a notification.
So, to receive a Notification, one must . . .
1. Add checkmark to "Notify me of replies" check box when starting or replying to a thread or
2. Click Notify button at the bottom of a thread, this does mandate that you post to that thread.
Once you flag a thread for Notify, you will get a Notify when the first reply occurs. Any subsequent replies will not send out a Notify until you log in and read the thread (maybe?). I am a little unsure if you must log in and read to reset the notify count or if you just have to read the thread (without logging in). I'll test that tonight.