"Interrupts" sound scary, at first.  The notion that interrupts are assigned
priorities is likely to seem still more difficult.  As usual, we try to humble
hard abstractions by likening them to something not at all abstract.  Hence
the dogs, below:
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<center>
<img width=582 height=262 src="smimages/n22r5-4.gif" alt="Interrupt Dogs">
</center>