SET(FACILITY_NAME)
     Sets or changes the facility name -- the first item in a message
     generated by DECTPU.  This built-in is valid only on VMS systems.
  Syntax
     SET (FACILITY_NAME, string)
  Parameters
     string     The facility name you want for messages -- such as, the name
                of the application you are creating.  The maximum length is
                10 characters.  The facility name appears in messages if you
                have used the SET (MESSAGE_FLAGS) built-in to either
                explicitly include the facility name in messages, or include
                the facility name only if enabled by the default message
                flags for your VMS process.
  Example
     SET (FACILITY_NAME, "myeditor");
     Sets the facility name so that status messages begin with MYEDITOR.