1.MAIL> SHOW KEY PF4

      DEFAULT keypad definitions:
        PF4 = "read" (echo, terminate)

      This example shows how to use the SHOW KEY command to display
      the definition of the PF4 key. When the PF4 key was defined,
      two qualifiers (/ECHO and /TERMINATE) were specified.

    2.MAIL> SHOW KEY/ALL
      DEFAULT keypad definitions:
        PF1 = "directory" (echo, state = FOLDER)
        PF2 = "HELP" (echo, terminate)
        PF3 = "select" (echo, terminate)
        PF4 = "read" (echo, terminate)
        PF5 = "NEXT" (echo, terminate)

      This example shows how to use the SHOW KEY command to display
      all of the key definitions that you have created with the
      DEFINE/KEY command.