There have been times that I have had to send many private chats to students during class. As the list of names got long, I had to continually scroll up and down to see if anyone had responded. I would like to suggest that a number or some kind of notification pop up at the top of the private chat list every time there is a new private message. Maybe that student's name moves up to the top. Also, it would be useful if the private chats could occur in a pop-up window so that the public chat can still be seen at the same time.