typedef struct MEIEventStatusInfo {
    union {
        MPIHandle  handle;  /* generic */
        MPIAxis    axis;    /* MEIEventTypeAXIS_FIRST ... 
                               MEIEventTypeAXIS_LAST - 1 */
        long       node;    /* MEIEventTypeCAN_FIRST... 
                               MEIEventTypeCAN_LAST - 1  */
        long       number;  /* MPIEventTypeMOTION 
                               MPIEventTypeMOTOR_FIRST... 
                               MPIEventTypeMOTOR_LAST - 1

    		                     MEIEventTypeMOTOR_FIRST ...
                               MEIEventTypeMOTOR_LAST - 1 */
        long       value;   /* MPIEventTypeEXTERNAL */
	    } type;

	    MEIXmpSignalID signalID;

	    /* Contents of addresses specified by MEIEventNotifyData{} */
	    union {
         long sampleCounter;
         struct {
              long sampleCounter;
         } motion;
         struct {
              long     sampleCounter;
              long     positionError;
              MEIInt64 actualPosition;              
              MEIInt64 commandPosition;
         } axis;
         struct {
            /* Data associated with the CAN event. */
            long data[4];
        } can;
         struct {
              long      sampleCounter;
              long      dedicatedIn;
              MEIInt64  encoderPosition;
         } motor;
         long word[MEIXmpSignalUserData];
     } data;
} MEIEventStatusInfo;

          

        MPINotify      notify
        MPIEventStatus eventStatus;

        . . .

        /* Wait for event */
        returnValue =
            mpiNotifyEventWait(notify,
                                         &eventStatus,
                                          MPIWaitFOREVER);
        msgCHECK(returnValue);

        if (eventStatus.type == MPIEventTypeMOTION_DONE) {
            MEIEventStatusInfo *info;

            info = (MEIEventStatusInfo *)eventStatus.info;

            . . .
        }