Synchronization and Device I/O (Windows CE 5.0)
You can synchronously perform the WriteFile, ReadFile, and WaitCommEvent functions.
Windows CE does not support the overlapped I/O functionality of Windows-based desktop operating systems. The lpOverlapped parameter to ReadFile or WriteFile must be NULL. Therefore, Windows CE cannot signal the event that is passed in when the I/O operation is completed. However, Windows CE does support simultaneous synchronous or asynchronous calls to ReadFile or WriteFile made by separate threads that are overlapped in time; this is not supported on Windows-based desktop operating systems.
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