Ending a Session

  To end your session, choose End Session from the Session
  Manager's Session menu.  Even if you choose End Session,
  you can still return to your session.  The Session Manager
  displays a dialog box asking you to confirm that you want to
  end your session.

  To return to your session, click on the No button.  To end
  your session, click on the Yes button.  All windows are closed.

  DECwindows displays the logo and the Start Session dialog
  box.