If you are using a commercial TCP/IP stack such as PC-NFS, or running a local area network such as Novell in addition to the TCP/IP, you must obtain the WinSock DLL directly from your network vendor.
If your WinSock DLL is not WinSock 1.1-compliant or you do not have a WinSock DLL installed, then you can use the shareware Trumpet WinSock. A compressed copy of this WinSock implementation can be found on NCSA's FTP server in the directory PC/Mosaic/sockets/. Download the files disclaim.txt and winsock.zip. (If you want to make sure you have the latest version of the Trumpet WinSock, it can be acquired via anonymous FTP from the server biochemistry.bioc.cwru.edu in the directory /pub/trumpwsk.)