I would like to take better advantage of comment notifications. Where can I find a complete account of how they work?
For example, it appears that writing @FullUserName in a comment will lead to a comment notification alerting that user to the comment. Is it necessary to use the full user name? For example, if someone write @Joel in a thread in which I have already commented, will I be notified? Must I use the @ sign at all? (I find the @ sign to be an unnatural and disruptive element in the comments and would like to omit it whenever possible.) I guess we needn't use @ when making a comment on the person's own answer or question. Is the person asking the question automatically notified of comments on an answer to that question?
Recently, I noticed when writing a comment that if I start writing with, say, @Noah (I hope he won't mind if I use his username as a hypothetical example), then a little hovering overtext window displays a fuller username completion, e.g. NoahSynder (even though the actual user name of the user had a space: Noah Synder, so I find this window to be odd), but this window disappears when I put a comma, as in "@Noah, now I begin my comment", but also it becomes bold when I follow the completion, as in "@NoahSynder ", but the window disappears when the comma immediately follows the name, as in "@NoahSynder, ". What is the significance of these various fonts and missing spaces and disappearing windows? I guess that the first window was a suggested completion, and a bold name means a successfully recognized name, or what?