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Unnamed section edit
The message is not written to 'system memory' but to a device that acts on the interrupt. That device might be in system memory space, i.e. memory mapped, but I doubt it can be read back and it definitely is not normal RAM.
Detail edit
This should have more detail. For example it should show the format of the information written and should explain how the appropriate interrupt handlers are identified and how the LAPIC/processor routes execution to the interrupt handlers. It should give an example of multiple interrupts for a single device. — Preceding unsigned comment added by 98.71.194.228 (talk) 14:28, 5 March 2015 (UTC)