The value of an instance of this object identifies
the MIB view of the SNMP context to which this
concsystual row authorizes read access.
The identified MIB view is that one for which the
vacmViewTreeFamilyViewName has the same value as the
instance of this object; if the value is the empty
string or if there is no active MIB view having this
value of vacmViewTreeFamilyViewName, then no access
is granted.