IHTMLElementRender and IHTMLDocument2 from IShellWindows

In this article on capturing images of HTML pages:
http://www.codeproject.com/internet/htmlimagecapture.asp

This line returns "interface not supported" when passing the
IHTMLDocument2 returned from an existing IE window obtained from
IShellWindows.

pElement->QueryInterface(IID_IHTMLElementRender, (void **) &pRender);

Any clues as to how to do this with an existing IE window .vs a
Webbrowser control?
.

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