A growing number of the 90,000 network programmers who bought Rich Stevens' UNIX Network Programming need to address a topic not covered by this classic--how to deal with Windows Sockets, also known as WinSock. This book is the defintive word on WinSock, offering a complete tutorial on how to work with Windows Sockets and sample code, which will be available on the Internet.
Good to learn socket programming on Windows. Particularly how to use the Windows non - blocking variants of the original API calls and how to integrate with the Windows message loop.
I guess less useful since the advent of multi threaded programming.