A unique value ASSIGNED by this host system to identify this
conceptual row in the 'xcmGenTrapClientTable'.
This object is used to specify the unique client index which was
chosen FOR the trap client registered in this conceptual row
(management station or proxy) at row creation and which SHALL be
used by the trap client to create any associated conceptual
rows in the 'xcmGenTrapViewTable'.
Usage: Conforming management agents NEED NOT preserve the
value of this object across power cycles for 'nonvolatile' rows
in the 'xcmGenTrapClientTable', but SHALL preserve the
configured associations with (any) subordinate rows in the
'xcmGenTrapViewTable'.