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Step 1: PE_BEGININPUT Submessage
Immediately upon calling DoDefaultPenInput, an application receives a WM_PENEVENT message with a PE_BEGININPUT
submessage. Sending WM_PENEVENT and PE_BEGININPUT via the SendMessage function is the equivalent of calling DoDefaultPenInput. The caller should not trap the PE_BEGININPUT submessage because DefWindowProc starts the chain of events based on this message. The application should
complete all its initialization work before calling DoDefaultPenInput.
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