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For full details see How do comment @replies work?.

Some quick remarks:

Space should be removed. The system tries to match what follows immeadiately after the @ until the first space (and one final punctuation is ignored) to a username with space removed. Part of the username also works. So @Joel is fine (except perhaps if there should be many Joels in the conversation) @Joel David Hamkins is the same as the system only looks until the first space (and ignores one interpunctuation-mark) thus @Joel, also works, but @Joel... not and @JoelDavidHamkins is what would be thecomplete version and what gets suggested.

For the window it is as you say it gives suggestions, you can type only part and select with 'tab' key to complete, if you select it becomes bold, exact match also makes bold as it is sort of autoselected. But you can also compltely ignore it. Just what is typed in the end is relevant, it is only an input-help (also see at the end).

That there is a fontchange is relevant as if there are still more than one match then there is more then one window and you can use 'tab' repeatedly to select one of them (the one selected is bold).

If you continue it dissapears as there is no more match @Joel, does not match part of your username but works as the interpunctuation is ignored, @Joel (with space) there is also no more window as you are ouside the scope of the @ after a space and so there is no reason to suggest anything anymore, but with @JoelD the window would still be there.

Also note that some people can sometimes be notified that do not get suggested, namely users that edited the post and moderators that closed a question.

Additional remark: in principle, the @ is crucial but as it always was the case a comment on a post notifies owner of a post. So here you do not need it. And also if there is a unique user that could be notified, say I had commented on you question and you replied in a comment with no others present, then I also get automatically notified even if you do not use an @ (whether you use my displayname or not). In such a situation it can happen that a staring @name is autodelete upon submission of the comment.

Second additional remark: no comments on answer do not automatically notify OP of question, you cannot even notify them via comments on the answer (except of course if they also commented there).

I hope this helps a bit, though I fear my reply is not very structured.

For full details see How do comment @replies work?.

Some quick remarks:

Space should be removed. The system tries to match what follows immeadiately after the @ until the first space (and one final punctuation is ignored) to a username with space removed. Part of the username also works. So @Joel is fine (except perhaps if there should be many Joels in the conversation) @Joel David Hamkins is the same as the system only looks until the first space (and ignores one interpunctuation-mark) thus @Joel, also works, but @Joel... not and @JoelDavidHamkins is what would be thecomplete version and what gets suggested.

For the window it is as you say it gives suggestions, you can type only part and select with 'tab' key to complete, if you select it becomes bold, exact match also makes bold as it is sort of autoselected. But you can also compltely ignore it. Just what is typed in the end is relevant, it is only an input-help (also see at the end).

That there is a fontchange is relevant as if there are still more than one match then there is more then one window and you can use 'tab' repeatedly to select one of them (the one selected is bold).

If you continue it dissapears as there is no more match @Joel, does not match part of your username but works as the interpunctuation is ignored, @Joel (with space) there is also no more window as you are ouside the scope of the @ after a space and so there is no reason to suggest anything anymore, but with @JoelD the window would still be there.

Also note that some people can sometimes be notified that do not get suggested, namely users that edited the post and moderators that closed a question.

Additional remark: in principle, the @ is crucial but as it always was the case a comment on a post notifies owner of a post. So here you do not need it. And also if there is a unique user that could be notified, say I had commented on you question and you replied in a comment with no others present, then I also get automatically notified even if you do not use an @ (whether you use my displayname or not). In such a situation it can happen that a staring @name is autodelete upon submission of the comment.

Second additional remark: no comments on answer do not automatically notify OP of question, you cannot even notify them via comments on the answer (except of course if they also commented there).

I hope this helps a bit, though I fear my reply is not very structured.

For full details see How do comment @replies work?.

Some quick remarks:

Space should be removed. The system tries to match what follows immeadiately after the @ until the first space (and one final punctuation is ignored) to a username with space removed. Part of the username also works. So @Joel is fine (except perhaps if there should be many Joels in the conversation) @Joel David Hamkins is the same as the system only looks until the first space (and ignores one interpunctuation-mark) thus @Joel, also works, but @Joel... not and @JoelDavidHamkins is what would be thecomplete version and what gets suggested.

For the window it is as you say it gives suggestions, you can type only part and select with 'tab' key to complete, if you select it becomes bold, exact match also makes bold as it is sort of autoselected. But you can also compltely ignore it. Just what is typed in the end is relevant, it is only an input-help (also see at the end).

That there is a fontchange is relevant as if there are still more than one match then there is more then one window and you can use 'tab' repeatedly to select one of them (the one selected is bold).  

If you continue it dissapears as there is no more match @Joel, does not match part of your username but works as the interpunctuation is ignored, @Joel (with space) there is also no more window as you are ouside the scope of the @ after a space and so there is no reason to suggest anything anymore, but with @JoelD the window would still be there.  

Also note that some people can sometimes be notified that do not get suggested, namely users that edited the post and moderators that closed a question.

Additional remark: in principle, the @ is crucial but as it always was the case a comment on a post notifies owner of a post. So here you do not need it. And also if there is a unique user that could be notified, say I had commented on you question and you replied in a comment with no others present, then I also get automatically notified even if you do not use an @ (whether you use my displayname or not). In such a situation it can happen that a staring @name is autodelete upon submission of the comment.  

Second additional remark: no comments on answer do not automatically notify OP of question, you cannot even notify them via comments on the answer (except of course if they also commented there).

I hope this helps a bit, though I fear my reply is not very structured.

For full details see How do comment @replies work?.

Some quick remarks:

Space should be removed. The system tries to match what follows immeadiately after the @ until the first space (and one final punctuation is ignored) to a username with space removed. Part of the username also works. So @Joel is fine (except perhaps if there should be many Joels in the conversation) @Joel David Hamkins is the same as the system only looks until the first space (and ignores one interpunctuation-mark) thus @Joel, also works, but @Joel... not and @JoelDavidHamkins is what would be thecomplete version and what gets suggested.

For the window it is as you say it gives suggestions, you can type only part and select with 'tab' key to complete, if you select it becomes bold, exact match also makes bold as it is sort of autoselected. But you can also compltely ignore it. Just what is typed in the end is relevant, it is only an input-help (also see at the end).

That there is a fontchange is relevant as if there are still more than one match then there is more then one window and you can use 'tab' repeatedly to select one of them (the one selected is bold).

If you continue it dissapears as there is no more match @Joel, does not match part of your username but works as the interpunctuation is ignored, @Joel (with space) there is also no more window as you are ouside the scope of the @ after a space and so there is no reason to suggest anything anymore, but with @JoelD the window would still be there.

Also note that some people can sometimes be notified that do not get suggested, namely users that edited the post and moderators that closed a question.

Additional remark: in principle, the @ is crucial but as it always was the case a comment on a post notifies owner of a post. So here you do not need it. And also if there is a unique user that could be notified, say I had commented on you question and you replied in a comment with no others present, then I also get automatically notified even if you do not use an @ (whether you use my displayname or not). In such a situation it can happen that a staring @name is autodelete upon submission of the comment.

Second additional remark: no comments on answer do not automatically notify OP of question, you cannot even notify them via comments on the answer (except of course if they also commented there).

I hope this helps a bit, though I fear my reply is not very structured.

For full details see http://meta.stackoverflow.com/questions/43019/how-do-comment-replies-work.

Some quick remarks:

Space should be removed. The system tries to match what follows immeadiately after the @ until the first space (and one final punctuation is ignored) to a username with space removed. Part of the username also works. So @Joel is fine (except perhaps if there should be many Joels in the conversation) @Joel David Hamkins is the same as the system only looks until the first space (and ignores one interpunctuation-mark) thus @Joel, also works, but @Joel... not and @JoelDavidHamkins is what would be thecomplete version and what gets suggested.

For the window it is as you say it gives suggestions, you can type only part and select with 'tab' key to complete, if you select it becomes bold, exact match also makes bold as it is sort of autoselected. But you can also compltely ignore it. Just what is typed in the end is relevant, it is only an input-help (also see at the end).

That there is a fontchange is relevant as if there are still more than one match then there is more then one window and you can use 'tab' repeatedly to select one of them (the one selected is bold).

If you continue it dissapears as there is no more match @Joel, does not match part of your username but works as the interpunctuation is ignored, @Joel (with space) there is also no more window as you are ouside the scope of the @ after a space and so there is no reason to suggest anything anymore, but with @JoelD the window would still be there.

Also note that some people can sometimes be notified that do not get suggested, namely users that edited the post and moderators that closed a question.

Additional remark: in principle, the @ is crucial but as it always was the case a comment on a post notifies owner of a post. So here you do not need it. And also if there is a unique user that could be notified, say I had commented on you question and you replied in a comment with no others present, then I also get automatically notified even if you do not use an @ (whether you use my displayname or not). In such a situation it can happen that a staring @name is autodelete upon submission of the comment.

Second additional remark: no comments on answer do not automatically notify OP of question, you cannot even notify them via comments on the answer (except of course if they also commented there).

I hope this helps a bit, though I fear my reply is not very structured.

For full details see How do comment @replies work?.

Some quick remarks:

Space should be removed. The system tries to match what follows immeadiately after the @ until the first space (and one final punctuation is ignored) to a username with space removed. Part of the username also works. So @Joel is fine (except perhaps if there should be many Joels in the conversation) @Joel David Hamkins is the same as the system only looks until the first space (and ignores one interpunctuation-mark) thus @Joel, also works, but @Joel... not and @JoelDavidHamkins is what would be thecomplete version and what gets suggested.

For the window it is as you say it gives suggestions, you can type only part and select with 'tab' key to complete, if you select it becomes bold, exact match also makes bold as it is sort of autoselected. But you can also compltely ignore it. Just what is typed in the end is relevant, it is only an input-help (also see at the end).

That there is a fontchange is relevant as if there are still more than one match then there is more then one window and you can use 'tab' repeatedly to select one of them (the one selected is bold). 

If you continue it dissapears as there is no more match @Joel, does not match part of your username but works as the interpunctuation is ignored, @Joel (with space) there is also no more window as you are ouside the scope of the @ after a space and so there is no reason to suggest anything anymore, but with @JoelD the window would still be there. 

Also note that some people can sometimes be notified that do not get suggested, namely users that edited the post and moderators that closed a question.

Additional remark: in principle, the @ is crucial but as it always was the case a comment on a post notifies owner of a post. So here you do not need it. And also if there is a unique user that could be notified, say I had commented on you question and you replied in a comment with no others present, then I also get automatically notified even if you do not use an @ (whether you use my displayname or not). In such a situation it can happen that a staring @name is autodelete upon submission of the comment. 

Second additional remark: no comments on answer do not automatically notify OP of question, you cannot even notify them via comments on the answer (except of course if they also commented there).

I hope this helps a bit, though I fear my reply is not very structured.