>> Interesting. I thought (in C) all variables exist on the machine stack?
> 
> Dunno. Often, the static variables (i.e., those with a lifetime that 
> matches the process) are allocated, well, statically. Whether it's part 
> of the stack that never gets popped or not isn't too relevant.

When it comes to watching the CPU twiddle individual bits, *everything* 
becomes relevant. (That's why it's such an inefficient way to debug 
things...)

> Anyway, so? The machine stack is in memory-mapped memory too, yes?

Usually. ;-) (I understand there are designs where it isn't. Not that it 
matters too much...)

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