Windows Tutorials - Herong's Tutorial Examples - Version 5.62, by Dr. Herong Yang
Winsock 2 API Architecture
This section describes the Winsock 2 API architecture. Winsock applications are interfacing with 3 DLLs: WS2_32.DLL, WSOCK32.DLL and WINSOCK.DLL.
The Winsock 2 architecture described in the Winsock 2 API specification
can be illustrated in this diagram:
As you can see from this diagram, there are 3 DLL (Dynamic Link Library) files installed on a Windows XP system to provide the Winsock API (Application Programming Interface) to all Winsock applications:
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