Any hidden field will do. It'll look something like
<input type="hidden" name="previewupdate" value="1" />
If you check for this in the form's real submission and don't include it on the initial pass to the preview page, then the preview page will show the summary without submitting the form. Then the user can submit the form for real on this page, because the submission includes the hidden field that triggers the real submission.
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Claire Ryan
interactivetools.com
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