This is a collection of code written by Berczi Gabor, who did a bunch of fantastic work years ago documenting the DOS interfaces to Windows 9x's network interfaces.
This is mirrored from Rich Dawe's site.
Subdirectories here:
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freesock - Berczi's sockets API that supports almost every DOS TCP/IP stack and is a fantastic source of documentation (even if in the form of code) for a lot of these APIs for which public documentation is sparse.
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vslsocks - Pascal interface to the Virtual Socket Library
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ws2dos - Pascal interface to the WSOCK2.VXD driver included in Windows 98. This is the closest thing that exists to documentation for the driver, and there's also information about the bugs that exist in the driver and how to work around them.
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wsockvdd - Berczi's driver that emulates the WSOCK.VXD interface on Windows NT.