Cross-domain-cookies - a maybe new idea

Question

My buddy Carsten Lau came along with an interesting idea on how to read cross-domain-cookies.

Situation: You want to read a cookie from domain \"A\" that was set on

Answer 1

This is normal, because you have control of the 2 domains. This is how most websites achieve cross domain single-sign-on by the way. But if you do not have control of the second domain you cannot read cookies from it.