Returns the current status for the mouse device driver event queue.

#define INCL_MOU
#include <os2.h>

PMOUQUEINFO    QueDataRecord;  /*  Pointer to the mouse queue data structure. */
HMOU           DeviceHandle;   /*  Reserved.  Must be 0. */
APIRET         rc;             /*  Return code. */

rc = MouGetNumQueEl(QueDataRecord, DeviceHandle);