The function prototypes and structures in this document can be found in WS2SPI.H.
New versions of WS2SPI.H will appear periodically as new identifiers are allocated by the Windows Sockets Identifier Clearinghouse. The clearinghouse can be reached via the world wide web:
http://www.stardust.com/wsresource/winsock2/ws2ident.html
Developers are urged to stay current with successive revisions of WS2SPI.H as they are made available by the clearinghouse.