PHONEINITIALIZEEXOPTION_ Constants
The PHONEINITIALIZEEXOPTION_ constants specify which event notification mechanism to use when initializing a session. 
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PHONEINITIALIZEEXOPTION_USEHIDDENWINDOW 
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The application desires to use the Hidden Window event notification mechanism. 
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PHONEINITIALIZEEXOPTION_USEEVENT 
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The application desires to use the Event Handle event notification mechanism. 
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PHONEINITIALIZEEXOPTION_USECOMPLETIONPORT 
- 
The application desires to use the Completion Port event notification mechanism. 
See phoneInitializeEx for further details on the operation of these options.