Generated by the pen driver component of the system when the input queue is
approximately half full. When an application receives PE_BUFFERWARNING, it should
immediately call GetPenInput
to drain the input queue. Submessage of WM_PENEVENT.
Extra information encapsulating a reference to the event and the HPCM
that generated it. Applications can use the EventRefFromWpLp
macros to retrieve these values.
If an application receives this message, it has fallen behind in processing
the input. The buffer is in danger of overflowing. The application should
repeatedly call GetPenInput
to gather the unprocessed pen input.
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