Action_line_prefixes

   An action line prefix is a modifier that controls the processing of a
   single action line in a description file.  The action line prefixes
   are:


   Prefix           Function

   - (Ignore)       Causes MMS to ignore errors generated by the action
                    line on which the prefix appears.

   @ (Silent)       Suppresses the writing to the output file of the
                    action line  on which the prefix appears. (The output
                    file can be either SYS$OUTPUT or the file specified
                    by the /OUTPUT qualifier).

   ?name (Severity) Use named user-defined severity rule to convert the
                    status returned by the action line to the equivalent
                    OpenVMS severity. Select 'Description_File' subtopic
                    'User_Defined_Severity' for more information.

   An action line prefix must appear as the first character on an action
   line.   The rest of the action line must be separated from the prefix
   by at least one space or tab.  To  use  more than  one prefix  on the
   same action line, type them next to each other with no intervening
   spaces; they must be separated from the rest of the action line with at
   least one space or tab.