Library /sys$common/syshlp/lse$help.hlb SET_BELL_ALL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Syntax:  SET BELL ALL boolean

  Sets the state that determines whether or not the terminal bell
  sounds when messages are written to the message window.

  LSE prompts you for a value.  Specify the parameter value on to set
  the bell on for all messages.  By default, the bell is set off.

  RELATED COMMANDS:

     SET BELL BROADCAST          SHOW ATTRIBUTES