The file input and output (I/O) functions ( CreateFile, CloseHandle, ReadFile, ReadFileEx, WriteFile, and WriteFileEx) provide the basic interface for opening and closing a communications resource handle and for performing read and write operations. The communications functions provide access to communications resources. This overview describes the use of file I/O and communications functions.

• Communications Resource Handles
• Modification of Communications Resource Settings
• Communications Resource Configuration
• Modem Configuration
• Read and Write Operations
• Communications Events
• Extended Functions

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Build date: 2/7/2012