The time of the event.
Specifies a value, from 4 to 31 inclusive, that becomes part of the request type code in the USB-defined setup packet. This value is defined by USB for a class request or the vendor for a vendor request.
Specifies the USB or vendor-defined request code for the device, interface, endpoint, or other device-defined target.
Specifies a value, specific to Request, that becomes part of the USB-defined setup packet for the target. This value is defined by the creator of the code used in Request.
S_OK or standard OLE error code.