Subject:   -37- How can I recover from a failed window manager
                customization attempt?
Date: 07 May 1993 00:00:01 EST

  If your attempt at customization leaves you in a state where buttons
  and menus are no longer recognized, you can recover by pressing the
  <Alt><CTRL><Shift><!>keys simultaneously. A menu appears that will
  let you choose Motif, Iris, or user defaults. Choose either Motif or
  Iris defaults and then push OK. This restarts the window manager to a
  usable state.