Device & User Question

I have a site that is using Device and User in Freepbx version 2.10, Asterisk 1.8. They have been using it for about a year now and for the most part it is working well. Except, when they login and forget to logout and login somewhere else. Is there a way I can query the system to see which users are logged into which devices? 2nd question, is there a way to indicate on the phone (Yealink T26) which user is logged into that phone. That would be awesome if I could do that.

Thanks for any ideas
Ed Lentz