## Pen for OS/2 Device Driver Reference

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### penclsQueryButtonData Parameter - pPenEventData

pPenEventData (PPENEVENTDATA) - in/out A pointer to a buffer that will receive the array of PENEVENTDATA structures. These structures contain the data to be used for the button list box in the Settings notebooks of instances of this class. 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 still be returned. This buffer must always contain one valid PENEVENTDATA structure for each button registered with the Writing subsystem by the device driver.