The tag for the target from which to obtain the data for
this data group.
A length of 0 indicates the local system. In this case,
access to the objects of this data group is under
the security credentials of the requester that set
cdcDGRowStatus to 'active'. Those credentials are
the input parameters for isAccessAllowed from the
Architecture for Describing SNMP Management Frameworks.
Otherwise a search is carried out for an entry in the
snmpTargetAddrTable whose snmpTargetAddrTagList contains the
tag specified by the value of this object. The security
credentials (snmpTargetParamsEntry) of the first entry that
satisfies the above criteria, are passed as input parameters
for isAccessAllowed.
This object's value may be modified at any time. The change
takes effect the next time data is fetched for this data
group.