Which objects are at a given screen location

[KimD]

Wow. I'm totally overwhelmed by the generosity of your responses; and on a Sunday!

The truth is that I had implemented a very basic solution to my problem after I replied to Klaus's post. Now I have three other options to think about:
1) "Within" function inside of a Repeat loop that checks all controls on a card
2) "Within" function inside of a recursive function call that checks each control on a card
3) "Intersect" function inside of a SetProp handler that checks any controls that move.

I will have a play with all of them after I've finished what I'm currently working on.

Thanks greatly

Kim