Is there an easy way to make sure that when a script receives a form post, that the form came from a particular file? I mean, say you have a file "form.php", which has a form in it which posts to "receiveform.php". Is there a way for receiveform.php to make sure the form was submitted from form.php? I know this could be done with $HTTP_REFERER, but that's not always reliable.
Thanks,
Jared