> That seems most common - for implementations that involve life and death,
> the systems tend to be custom-built for a specific purpose, not based on
> a general purpose operating system.

It's not just the software, all the hardware will also need to be certified 
for applications where human life is at risk.  You think your PC is 
reliable?  You trust it enough, that if it ever failed you'd die?  Didn't 
think so :-)

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