This book describes the Windows Sockets application programming interface (API), commonly known as "WinSock." This is intended to be a companion to the v1.1 Windows Sockets specification, not a replacement for it. The contents provide a roadmap for the specification, an orientation resource. The book describes and illustrates every aspect of the Windows Sockets specification, from top to bottom. It deals with optional features as well as many features in version 2.0 of the Windows Sockets specification. -This book describes the Windows Sockets application programming interface (API), commonly known as "WinSock." This is intended to be a companion to the v1.1 Windows Sockets specification, not a replacement for it. The contents provide a roadmap for the specification, an orientation resource. The book describes and illustrates every aspect of the Windows Sockets specification, from top to bottom. It deals with optional features as well as many features in version 2.0 of the Windows Sockets specification.