The Msft_WmiProvider_UnLoadOperationEvent event class defines the removal of the provider cache entry. At this point there ...

The Msft_WmiProvider_UnLoadOperationEvent event class defines the removal of the provider cache entry. At this point there will be no reference held by WMI onthe COM server instance.  WMI caches provider registration objects to decrease overallexecution time. The substem will drop cache entries either through the cache ageing process, through loss of RPC connectivity, through user control or due to some change in the provider's registration.