Assigns a new event mask to the current mouse device driver.

#define INCL_MOU
#include <os2.h>

PULONG    EventMask;     /*  Mouse device event mask pointer. */
HMOU      DeviceHandle;  /*  Reserved.  Must be 0. */
APIRET    rc;            /*  Return code. */

rc = MouSetEventMask(EventMask, DeviceHandle);