## Pen for OS/2 Device Driver Reference

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### penQueryButtonData Parameter - pPenEventData

pPenEventData (PPENEVENTDATA) - in/out A pointer to a buffer that will receive an array of PENEVENTDATA structures. The structures contain the data to be used for the button list box in the Settings notebook of this object instance. The caller is responsible for ensuring that the buffer is large enough to receive the data. If this parameter is NULL, the size of the buffer needed to hold the data will be returned.