> Yes. The paper specifically mentions this, and how it breaks the
> spreadsheet model by making each cell's value time-dependent.
>
> (They referred to it as a "dangerous feature". I'm not sure I'd go that
> far, but...)
>
> Usually you use this because you expect the values involved to converge
> to some kind of fixed-point after a few iterations. If that actually
> turns out to be true, then time-dependent behaviour isn't such a big deal.

I think at some point in the past I actually wrote a simple cpu 
instruction decoder and emulator in Excel. If you set "iterations" to 1 
each time you hit refresh it would increment the program counter, read 
and decode the instruction it pointed to and update registers etc. Was a 
pretty awesome abuse of Excel :-)

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