Custom (?) error page?

D

Da Groover

I need to call a custom (HTML) error page when a required field is left
blank on a web order form. The only indication now is the "stock" page
that not only tells what was missing but all other data - inputted and
hidden including name of email notification page and email address. How
can I call this custom page in case of an ommitted entry and how do I
limit the amount of information given on it?
 
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