In previous versions of Windows with Internet Explorer, some Web pages could access objects cached from another Web site. ...

"In previous versions of Windows with Internet Explorer, some Web pages could access objects cached from another Web site. In Windows XP Service Pack 2, a reference to an object is no longer accessible when the user navigates to a new domain.

For Windows XP Service Pack 2, there is now a new security context on all scriptable objects so that access to all cached objects is blocked. In addition to blocking access when navigating across domains, access is also blocked when navigating within the same domain. (In this context, a domain is defined as a fully qualified domain name (FQDN)). A reference to an object is no longer accessible after the context has changed due to navigation."
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