It has been observed that once the user logins to the Collaborator and all the floating user licenses has been consumed he is not shown the initials (login names) of all users that are already logged...
It would be useful to show the Last Activity timestamp and email for each logged in user as well (sorted by timestamp). The user could then email someone who's been idle for the longest time (i.e. someone likely not using thier license and the system is just waiting to log them out automatically after the 1 hour inactive limit).