It has TransmitFile and TransmitPackets: https://msdn.microsoft.com/en-us/library/windows/desktop/ms740565(v=vs.85).aspx https://msdn.microsoft.com/en-us/librar

It has TransmitFile and TransmitPackets: https://msdn.microsoft.com/en-us/library/windows/desktop/ms740565(v=vs.85).aspx https://msdn.microsoft.com/en-us/library/windows/desktop/ms7... They were in use (at least TransmitFile was) by IIS long before http.sys was conceived.