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CreateFile, ReadFile, WriteFile, CloseHandle
Da MSDN :
Communications Resources
The CreateFile function can create a handle to a communications resource, such as the serial port COM1. For communications resources, the dwCreationDisposition parameter must be OPEN_EXISTING, and the hTemplate parameter must be NULL. Read, write, or read-write access can be specified, and the handle can be opened for overlapped I/O. For more information about communications, see Communications.
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