Thanks @JammyDodger! I was trying to figure it out because I just re-categorized a thread & updated its title & wanted to notify the folks who had participated. But without being sure what here did, I was afraid to use it.
And at a minimum, I suppose the description of the “here mention” field could be improved to something like:
Name used for
@heremention to allow a privileged user to notify up to 10 people participating in the thread. Must not…