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If you disable the element, then it will not be submitted with the form. You can do this with javascript, like this:
<form action="page.php" method="post" onsubmit="this.form.nogood.disabled=true;">
<input type="hidden" name="nogood" value="null">
</form>
This will disable the "nogood" input when the form is submitted. Note that this does rely on Javascript, so if JS is disabled, then the field will be submitted with the form. The safe approach would be to ignore the field on the next page, if that's possible.
Chad