<p>It depends -- if you use the <code>@-reply</code> feature and the other person is already in the thread, then yes they will receive a notification.</p>

<p>Let's look at an example:</p>

<p><img src="https://i.stack.imgur.com/98EYw.png" alt="comments example"></p>

<p>In this picture, I've underlined the <code>@-replies</code> and circled various people who received replies in the course of the conversation. The user named <code>Yannis</code> is highlighted in gray because he was the owner of the post that these comments are attached to.</p>

<p>Through the course of the conversation, <code>Yannis</code> received the replies to <code>@YannisRizos</code>, both because he was "pinged" as well as because he owned the post. The user <code>John Dibling</code> received notice about any posts that included <code>@JohnDibling</code> in the body at all, just as <code>Shog9</code> received messages directed towards <code>@Shog9</code>. </p>

<p>Later on in the conversation, someone else (not Yannis) responds to <code>McCannot</code> as well.</p>

<p>Noteworthy: you <strong><em>cannot</em></strong> ping more than one person in a comment. Thus, if you wish to respond to BOTH another commentor as well as the post owner, you must <code>@-reply</code> the other commentor and you can mention the post owner; the latter will be notified regardless of <code>@</code> usage.</p>

<p>I hope this helps!</p>
