Forum Moderators: open
i.e.
mydomain.com => myframes.html
frame1 => myheader.html
frame2 => [yahoo.com...]
In the above example, you would be restricted by Javascript security from accessing the info you mention, and most other info about the contents of frame2, as well. This is to keep webmasters from making sites that track users once they elect to leave the site.
It's a good thing. :)