To get an overview on the currently loged in users and their session
properties the "Session Management" link in the admin area can be used.
Some general information about all active sessions are displayed, e.g. how
many users currently are loged in, how many agent and customer users are
using the system, e.g. With the "kill all sessions" button all users
sessions can be deactivated. Also detailed information for every session are
available and every session can be removed separately.