This updated edition provides the latest information about how to write applications that take advantage of the advanced networking protocols and technologies that Microsoft Windows XP supports-Internet Protocol (IP) versions 4 and 6, Pragmatic General Multicasting (PGM) protocol, Internet Group Management Protocol 3 (IGMPv3), IPv6 multicasting, the Network Location Awareness (NLA) namespace provider, the Winsock Provider Interface, 64-bit Winsock APIs, and .NET Sockets. The book includes code samples in the Microsoft Visual Basic, Microsoft Visual C++, and Microsoft Visual C# development systems.