Listen to URL change in opened window

Question

If I open a window (with window.open), can I detect when its URL changes (to a specific one), given that:

• The initial URL for the window is on another domain (Facebook, to be precise)
• The URL I'm interested in detecting is too

I need this for authentication. See "Desktop apps" at the bottom of this page.

Answer 1

As long as the new url resides on a domain not considered equal to your own by the Same Origin Policy, then this will impossible.