MotionEventNotifyGet writes
the event mask (that specifies the event type(s) for which host
notification has been requested) to the location pointed to by eventMask,
and also writes it into the implementation-specific location pointed
to by external (if external is not NULL).
The event notification information in external is
in addition to the event notification information in eventmask,
i.e, the event notification information in eventmask
and in external is not the same information. Note
that eventmask or external can be NULL
(but not both NULL).
Event notification is enabled for event types specified in eventmask,
which is a bit mask generated by the logical OR of the MPIEventMask
bits associated with the desired MPIEventType values.
Event notification is disabled for event types not specified in
eventmask.
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