It's also considered polite to 'ping' someone to a post if their name is mentioned in your post. Example, I am posting to you and I mention SE Mom. In the TO: box I would put davandbar; SE Mom.
Thank you so much for anwering my stupid question. I thought it probably was related to that, but I wasn’t sure if I could just type in another name or if I had to link it somehow so it would alert them also.