[posibleOT] Forcing entering te site thru index.php

Hello everybody. Well, i'm trying to avoid access to the site for the middle. Say there is a initial page with a form and other pages that depends on this. Is there a way to force users access the site thru the initial form page, regardless of the url? Something like this: lynx http://mysite/forma2.php/ produce the browser to redirect to http://mysite/index.php/ Of course, the forma2.php must be served if its accesed after index.php. Thanks -- Fernando M. Maresca Cel: (54) 221 15 502 3938 Cel: 0221-15-502-3938