NetMDUSB!SonyUsbControlRecive function prototype

Hi, i've been at NetMDUSB.dll again, looking at SonyUsbControlRecive

So far I have guessed that it takes 5 params, And that the function might be
like this.
DWORD MDhandle handle of the MD driver given to DeviceIOControl as hDevice
DWORD Vendor Request ID (thanks Marcus Brinkmann, I think I know what that
means now!)
DWORD Pointer to the output buffer
DWORD Length of output buffer
DWORD Number of bytes received

Return, always seams to be one, so i would GUESS its sucess 0 for failure,
but i haven't checked that bit through in the disassembly yet!

If this is incorrect, or anyone has bothered to work out any of the others,
then please do tell!