You can check the currently logged-on user on the logon user administration screen and forcibly log out.
In this screen, you can check "Account" "Time logged on" "Time last accessed" in the list.
By clicking the "Refresh Screen" button, you can display the latest logon status.
In Figure 1, you can forcibly log off the logged on account by clicking on the "Disconnect" button.
In the disconnection operation, it is recorded in the log (system.log) as follows.
[INFO jp.jasminesoft.jfc.LogonStatusManager removeUserName] (admin @ localhost) JFC - 90003: The account suzuki has been removed from the session.