Since both IM and FB manuals say you can't put an ARC shape in a
region, does anyone know (Mars perhaps?) any way of getting around
that or any clever (fast) way of detecting a click on an ARC segment?
(preferably just the space between the Arc perimeter and its chord).

I was thinking that I could do a good approximation if I knew how to
mimic the ARC function as a series of MOVETO, LINETOs
- make that into a region and presto but all I can remember from my
school geometry is x*x+y*y=r*r but that's for a circle, not an oval -
And I still a long way off from producing a replica of the FRAMEARC function.

Any help would be appreciated (like what's the formula for an oval?)
- I'll post back any finished routine (for everyone's delight) to Bill's
website.

Andy