Here's how to require user to pass a particular param type to acell function (intercepting #VALUE).
Keiji:
As indicated in the subject field of my msg., I don't *want* the user
to see #VALUE. That's crummy programming.
I want him not only to see a humanly understandable message, but tell
him what he must do to fix the prob.
Thanks as usual to you & all who answered.
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