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Definition: Winsock

(WINdows SOCKets) The Windows interface to TCP/IP, which is the communications protocol of Unix networks and the Internet. Windows network applications that communicate via TCP/IP are Winsock compliant as are the implementations of the TCP/IP protocol from Microsoft and third parties.

The WINSOCK.DLL file is included with all Windows versions subsequent to Windows 3.1. Early Internet applications often installed the DLL to ensure its existence.