"Tom Ogilvy" wrote...
....
Works if you just start typing - however, if you go into edit mode by
hitting F2 or clicking in the formula bar, then it doesn't work since Onkey
doesn't work in Edit mode.
....

Definitely not robust. Also not easy to correct mistyped 3rd digits, though
I suppose I could have trapped the [Backspace] key an a few others.

Maybe worthwhile to check the 123 user forum. 123 still provides {GET} and
{LOOK} macro statements that trap single keystrokes (so it *can* be done by
some API call), but these two were very seldom used, and macros using them
were very complicated and very fragile.