This read-create Unsigned32 object holds the index into the varbind list of the notification named by alarmModelNotificationId, pointing to the object whose value identifies the affected resource. Administrators use it when a resource cannot be identified through alarmModelVarbindSubtree and alarmModelResourcePrefix alone, since a nonzero value here signals that alarmActiveResourceId should instead hold the RowPointer to the corresponding varbind in alarmActiveVariableTable. For example, a value of 0 means this index is unused, while a value of 4 would point to the fourth varbind in the notification's list as the resource identifier.