According to this help page, you can get someone's attention by starting a message with @. But I don't see what it does. What I want is similar to IRC - normal messages don't make a sound effect, but ...
It sometimes becomes too cumbersome to open each unread item on the "Hey" list to turn their status into "Read". Do you know of a practical way to get rid of the unread items on "Hey" list? PS: This ...