The time of the event.
Specifies the USB-defined feature code to be cleared or set. Using a feature code that is invalid, cannot be set, or cannot be cleared will cause the target to stall. The bus driver will copy the value in the FeatureSelector member to the wValue field of the setup packet.
Specifies the device-defined index, returned by a successful configuration request, if the request is for an endpoint or interface. Otherwise, Index must be zero. The bus driver will copy the value in the Index member to the wIndex field of the setup packet.
S_OK or standard OLE error code.