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However, if for some reason you don't have access to any of those, then you would need to submit the form using the GET method so that the form inputs were passed via the querystring. If your form contains any information that needs to be secure (usernames, passwords, credit card info, etc.), then you definately should NOT be using the GET method. But otherwise, your form would have something like:
<form action="nextpage.htm" method="get">
Then on nextpage.htm, you would need to parse the query string for the form inputs, find the one you were looking for, and assign the value to a hidden input field (or use JavaScript to write out the hidden input field).