Citrix released a new tool where you can select a farm and see all sessions and can manipulate them.

Quote from citrix "

This tool provides Citrix Administrator’s with a quick and easy way to search sessions in the farm so that they can log off, disconnect, and send messages to sessions, or kill processes.

Also, users without Citrix Administrator rights will be able to list their active or disconnected sessions in the entire farm with the possibility of disconnecting or logging off those sessions"

Download the tool CTX121653