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Possible Duplicates:
What is the relevance of “@” in comments?
How do comment @replies work?

The title says it all. I noticed this in a lot of comments and answers. I'm not sure what the purpose is though.

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marked as duplicate by George Stocker, Tim Stone, kiamlaluno, Michael Mrozek, Robert Harvey Jul 24 '11 at 22:38

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 3 down vote accepted

The @reply allows a person to direct their comment to another user (one who has participated in the question (by editing, replying, or commenting). The system is able to send that comment to the target user and it appears in their inbox.

See: What is the relevance of "@" in comments?

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