[MSDN Library June 1998] 6.1 Windows Sockets Helper DLL Architecture (81.8181818181818%)
MSDN Library Visual Studio 6.0 > DDK Documentation > Microsoft Windows NT 4.0 DDK > Network Drivers > Design Guide > Part 3: Intermediate NDIS Drivers and TDI Drivers > Chapter 6 Transport Helper DLLs for Windows Sockets