Microsoft Extensions and Windows Sockets 2
The Windows Sockets 2 specification defines an extension mechanism that
exposes advanced transport functionality to application programs. For more
information, see Function Extension Mechanism
The following Microsoft-specific extensions were added to Windows Sockets 1.1.
They are also available in Windows Sockets 2.
These functions are not exported from the WS2_32.DLL; they are exported from
An application written to use the Microsoft-specific extensions to Windows
Sockets will not run correctly over a Windows Sockets service provider that does
not support those extensions.
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