[MSDN Library June 1998] SPI: Semantic differences between multipoint sockets and regular sockets (78.2738095238095%)
MSDN Library Visual Studio 6.0 > Platform SDK > Networking and Distributed Services > Windows Sockets Version 2 > Windows Sockets Version 2 SPI > Overviews > Windows Sockets 2 Transport Provider Requirements > SPI: Protocol-Independent Multicast and Multipoint