@param[in] HandlerType Points to the handler type or NULL for root SMI handlers.\r
@param[out] DispatchHandle On return, contains a unique handle which can be used to later\r
unregister the handler function.\r
@param[in] HandlerType Points to the handler type or NULL for root SMI handlers.\r
@param[out] DispatchHandle On return, contains a unique handle which can be used to later\r
unregister the handler function.\r