It's early so I may not have understood the question properly but maybe this 
might help :)

IE blocks 3rd party cookies (AFAIK firefox doesn't) but IE can read 3rd 
party cookies if the site that set the cookie has a P3P Compact Policy 
(which is a custom header sent by IIS / Apache). See below for more info.

http://www.webmasterworld.com/forum88/6184.htm

Some info on 3rd party cookie reading
http://www.west-wind.com/wiki/wc.dll?wc~howtomakewwwcp3pcompactpolicycompatible

----- Original Message ----- 
From: "Joe Velez" <[EMAIL PROTECTED]>
To: "CF-Talk" <[email protected]>
Sent: Sunday, April 23, 2006 4:27 AM
Subject: Re: 3rd Party Cookie Reading


Thanks.
Basically I want to set a cookie on 1 site ... but then read the same cookie
on a different site. Maybe its not exactly 3rd party by def.


----- Original Message ----- 
From: "Rick Root" <[EMAIL PROTECTED]>
To: "CF-Talk" <[email protected]>
Sent: Saturday, April 22, 2006 7:47 PM
Subject: Re: 3rd Party Cookie Reading


> joe velez wrote:
> >
> > I would like to be able to have a script run using an embed tag or
iframe, etc that can read cookies from another site.
> >
> > Lets say SITE_A sets a cookie "test" with value "thevalue".
> > From SITE_B I would like to read the cookie 'test' and know that the
value is "thevalue".
> >
> > How can this be accomplished? Can it?
>
> If you set the domain for the cookie to the domain for site B, it can be
> read on site B.  Of course, then it can't be read on Site A so maybe
> that's not what you're looking for.  And some security software blocks
> "third perty cookies" too.
>
> Rick
>
>



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