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It does not do anything as far as programming. It is just a social construct we have all adopted to show who we are addressing our comment at.

And now, it also notifies the target:

Normally, you only get notified of comments when you own the post.

You will now get notified of any comments that refer to you by @username in a comment, even if you do not own the post.

Rules:

1. Only applies to other people in the comments that you are commenting on.

2. Response must include @username that you are referring to, where "username" is a reasonable match to the user's current display name (as seen in the comments above yours).

3. There must be a starts-with, case insensitive match of at least THREE characters to the displayname. So @a and @ab will never match anyone or anything.

4. Spaces cannot be used to match, so if the person's display name is "Peter Smith" then just use @peter to match.

5. Matching is performed in reverse chronological order, so if there are five people named "John" in the comments, writing "hey @john, have you considered apples?" will match the most recent John to comment.

12. Only one person can be replied to at a time in a comment. The first one "in" wins.