Returns the number of buttons supported on the installed mouse device driver.

#define INCL_MOU
#include <os2.h>

PULONG    NumberOfButtons;  /*  Number of mouse buttons. */
HMOU      DeviceHandle;     /*  Mouse device handle. */
APIRET    rc;               /*  Return code. */

rc = MouGetNumButtons(NumberOfButtons, DeviceHandle);


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