I have a .php web page that has access from a WordPress form (Formidable plugin). The form collects information and then directs to the page. Every time the viewer comes to the site, they have to go through the form. I would like the form to only be a one-off so clients don't have to re-fill the form when they come to the site.
I have a .php script in place that forces the viewer to come from the Formidable WP form login page.
Let me know if you have any questions.