From the '/admin' screen under "System Status/Settings" there is a menu "Active Logins".
From the TPAM System Administration Guide section on "Active Logins":
"To view all user IDs currently logged on to TPAM select System Status/Settings | Active Logins from the menu. The session start time is displayed in server time (UTC). To view the user details select the User from the list and click the User Details tab. To terminate a user’s session in TPAM select the User from the list and click the Terminate button."