What does <== mean on D APPL=appl ?
<== between User and Terminal on Application Detail Display (TEN0203) indicates that the session is currently active.
When the record does not have <== , the session is inactive.
A session of user @userA on Terminal A55TG001 is active.
A session of user @userB has no terminal. The session was terminated without application logoff, like cutting off the terminal.