Vista - Access to Document of Internet Explorer Dialog

I'm new to powershell, so please forgive me.

I can get access to IE and the top-level document. What I need is
access to the document in the modal dialog that was initiated from the
top-level document.

Any ideas on how I can do this?

Thanks

Well, I can get access to the dialog/child window using WASP. It's
name is Internet Explorer_TridentDlgFrame. But access is limited to
basic Windows semantics. I can send keys, move it, close it, but I
cannot get to the contents within. I need the HTML DOM document that
that dialog/child window is holding.