On VAX systems, the implementation of security auditing within
    SYSGEN has altered the reporting of modifications to the system
    parameter file VAXVMSSYS.PAR. System managers can receive
    notification of a change to the file by setting up an access
    control list (ACL) on the file to signal such an event, as in the
    following example:

    $ SET SECURITY/ACL=(ALARM=SECURITY,ACCESS=WRITE+FAILURE+SUCCESS)-
    _$ SYS$SYSTEM:VAXVMSSYS.PAR

    For more information about setting ACLs, refer to the OpenVMS
    User's Manual and the HP OpenVMS Guide to System Security.

    On Alpha and Interity servers, both the WRITE ACTIVE and WRITE CURRENT
    commands send a message to OPCOM and log the event.

                                   NOTE

       Prior to Version 7.3-2, enabling SYSGEN audits or alarms
       did not provide audits or alarms with information about
       the parameters being modified. Beginning in Version 7.3-2,
       audits or alarms provide a list of the changed parameters
       along with their old and new values.