I/O Compleiton Ports

Can anybody tell me how these are used? Pretty confused about them.

Some sample code would be great.
Thanks in advance.....
sArunimaAsked:
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AlexFMCommented:
I learned IOCP by this sample:

http://www.codeproject.com/internet/winsockiocp.asp

Using IOCP means that you associate some I/O operations (file, socket...) with completion port. Now any I/O operation (ReadFile, send, recv...) returns immidiately, and program waits for it's actual completion on completion port. All IOCP sample are complicated, but you need to spend your time and understand one of them.
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