>>From the point of view of protecting this system from counterfeiting &
> unauthorised access, is it possible to interrupt processing config.sys? I
> had read about pressing F5 to bypass config.sys and autoexec.bat. Also that
> this can be disabled in config.sys.

modify kernel.sys by using

 sys config kernel.sys SKIPCONFIGSECONDS=-1

to disable F5/F8 completely.

OTOH, removing command.com will also completely disable tinkering with
the system.

> Another thought I have - what would the behaviour of the kernel be if my
> program (as the command processor) does terminate? Does it reboot, restart
> the command processor, or just hang?

most likely just hang. test yourself.


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