webpage that is accessible only from certain links?

[tspirtle]

I have a webpage that I want to be accessible only when entering their email. I currently have an email system (PHP) in place that collects the email address of a user, sends an email confirmation and shows a confirmation page.What I am attempting to do is have it so this confirmation page is the only page that will get you to a second webpage. If you try to access this second webpage from anywhere else, it should refuse access, give an error, or point back to the page where you are prompted to input your email.So my question is how do I create a handshake between the two webpages and block all other requests?There may be a better way to do this that does not require a handshake between the two webpages, if you know another way to get the same result, fantastic.So far I have thought maybe there could be a way to do this using htaccess, although I'm a newbie.