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Event trigger for ReadFile?

I am accessing multiple serial ports using CreateFile to get a handle to the port and then using WriteFile to output strings to equipment that my program is controlling. I would like to know how to trigger an event when there is data at the serial port for ReadFile to retrieve.
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See http://msdn.microsoft.com/library/techart/msdn_serial.htm - this article describes this issue in-depth...

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