I have a site which when you log into, it loads another site in an iframe to log you into that site as well (Single sign on). It works awesome in firefox, and if I use tabbed windows in IE7 it works as well. But if I open a new window and browse to the third party site, I am not logged in.
I have come to the conclusion that the cookie in IE is not being created and have been reading a bit about p3p, but I am not sure if I am the one who needs to implement this into my site, or if the third party needs to have p3p setup.
Can anyone shed some light on this subject please?
