Syntax:  HELP KEY user_key_name

  Displays help information for the indicated key.

  The help text describes the functionality bound to that key.  If you
  enter HELP KEY CTRL/E, for example, you get the help text for the
  EXPAND command.

  RELATED COMMANDS:

     HELP                        SET LANGUAGE HELP LIBRARY
     HELP INDICATED              SET LANGUAGE HELP TOPIC
     HELP KEYPAD