FAQ Topic - Why do I get permission denied when accessing a frame/window? (2008-08-31)

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FAQ Topic - Why do I get permission denied when accessing a
frame/window?
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In the normal browser security model, it is impossible for a
script from one domain to access the properties of pages served
from another domain, or a different protocol. Any attempt to
access a property in such cases will result in a "Permission
Denied" error. Signed scripts or trusted ActiveX objects can
overcome this in limited situations.

http://msdn2.microsoft.com/en-us/library/ms533028.aspx


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