Load a Contao website in an iFrame

In one of my projects the contao website gets loaded in an iFrame on another website. However in IE7 the cookies of the contao website are treated as a third party cookie.

I used the following fix:
On system/initialize add at the start the following code

Code:

---

header('P3P: CP="CAO PSA OUR"');

---

See also http://james.jamesandkristin.net/2005/1 ... t-explorer