Register for a thread

Is there a way to register (and unregister) for a thread. By that I mean I would like to be notified when any new post is submitted to a particular thread. If not, can it be done? (To be more accurate, it can be done, but do you think it would be worth the effort?)To be efficient, after registering I would be notified of the next post, then not be notified until I visit the thread. My registeration could be canceled by either my visit or by the first notification email sent to me. When I visit the thread, I could register again. Registration would need to be simple such as a button click.

Hello Admin,I do elect to receive notifications to my posts and to the threads I initiate. In addition, I want the ability to be notified when ANYONE replies to a thread that I find interesting. Not all interesting replies are directed to me. From your earlier post I conclude that you understand this and will or have put my suggestion under consideration.
Thanks for your time,
bkelly