Facebook iframe not working in IE; session/login issue?

Question

I have an issue with my Facebook canvas iframe application.

I\'m using sessions to build a simple questionnaire-style application. There\'s a question on each page, when

Answer 1

Quoting from http://adamyoung.net/IE-Blocking-iFrame-Cookies

"The problem lies with a W3C standard called Platform for Privacy Preferences or P3P for short. You can read all about the boring stuff via the link or else just install the P3P Compact Policy header below. This will allow Internet Explorer to accept your third-party cookie. You will need to send the header on every page that sets a cookie."