What is in it, and when will it be available?

When I started the second edition in 1996 I just started with the Sockets chapter, seeing how big it got. I had originally planned to include IPC (Chapter 3 in the 1990 edition) and applications (the last half of the 1990 edition) but they just don't fit.

The second edition of UNIX Network Programming will therefore appear in multiple volumes.

The 1990 edition will remain in print until Volume 3 is published.