cakePHP / referer

Hi all,

My client has a number of videos they’d like to host on a wordpress site but only make them accessible to people that have previously logged in via a separate website.

Does WordPress have the ability to check the previous page eg. cakephp (framework that they use) has a variable called referer. What they would want is that the pages on their main (wordpress) website only accessible from links from their web app. So it would just check the referer was from the web app domain and if it wasn’t deny access to the page.

If so, how do I install this function?

Thanks for your help!!
Val