[MSDN Library June 1998] Attributes in WSAPROTOCOL_INFO struct (22.2570128529881%)
MSDN Library Visual Studio 6.0 > Platform SDK > Networking and Distributed Services > Windows Sockets Version 2 > Windows Sockets Version 2 API > Overview > Multipoint and Multicast Semantics > WinSock 2 Interface Elements for Multipoint and Multicast