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Index Word Description
0 Header code [0x00150082]
1 Interrupt
2 Channel
3 0x0
4 Event handle (0 = unregister the event that was previous registered)


Index Word Description
0 Header code [0x00150040]
1 Result code


Application should unregister the event by setting handle to zero. If the session was closed before the event was unregistered, it will cause a handle leak in DSP process.

DSP can hold up to 6 concurrent registrations. More than that will cause registration to fail.

Interrupts with interupt=2 are related to pipes. The channel argument is the same as the pipe channel argument. The interrupt is signalled when data is available on the related pipe or when a related event occurs.