There are several other FAQs I think you will find helpful:

• The comp.os.programmer.win32 API FAQ has an Internet Programming section you should check out.
• PCAUSA has several FAQs related to the layers below Winsock: TDI and NDIS.
• Thamer Al-Herbish has a FAQ about Raw IP Networking on Unixlike platforms. True, it does not cover Winsock, but it is often easier to give Windows a miss if you want to build an application reqiring raw socket I/O.
• There is a close relation to the Winsock Programmer's FAQ that you may want to take a look at: the Unix Socket FAQ.
• The TCP/IP FAQ is useful for Winsockers, though when it dips into programming issues it maintains a Unix sockets viewpoint.