check out sessions here http://www.php.net/manual/en/ref.session.php

they use cookies but only to store the session id, not the actual string. If the user has disabled cookies, then it will put the session id in the URL, like http://www.somedomain.com/page.php?p...4723t48yg23jh3 which it will automatically append

If you don't want to use sessions then as I said just write the string to a flat file in the first script, then read the same file back again in the second script. The user will never know it's happening

Check out file handling stuff here http://www.php.net/manual/en/ref.filesystem.php