Ah, right, thanks. So this is a problem only if we have in-page widgets from a1.com that load on p1.com and hope to find a the currently logged in user there. M

Ah, right, thanks. So this is a problem only if we have in-page widgets from a1.com that load on p1.com and hope to find a the currently logged in user there. Makes sense, that's basically what an ad is.