1.2  Index of service message types by name

     Change indicators

     a plus sign (+)    for an addition
     an asterisk (*)    for an amendment to structure
     a hash sign (#)    for changes to names
     a vertical bar (|) for changes to text for descriptions,
                        notes and functions
     a minus sign (-)   for a deletion
     a X sign (X)       for marked for deletion
     a letter R (R)     for a message whose structure has been
                        completely recast. No other change symbols
                        shall be used with this message

   Code   Name                                           Version  Rev

   AUTACK Secure authentication and acknowledgement      4        1
          message
   KEYMAN Security key and certificate management        4        1
          message
   CONTRL Syntax and service report message for batch    4        1
          EDI
