Hi David,
Well, I have to admit I haven't had a need to use
circular references for some time (at which time I was
using Quattro Pro). But, as far as I know most (or
possibly all) versions of Excel will let you use circular
references, but will only do a set number of iterations.
Currently I have Office XP, and it will only resolve
circular references over the number of iterations
specified under Tools|Options on the calculation tab.
I agree though, that Excel's approach is much different
than say the old Quattro Pro version, which seemed to
handle them better.
-Ted Allen