"top" object

PM <[email protected]>
Newsgroups gmane.comp.mozilla.devel.dom
Message-ID <[email protected]> 
Hi,

I need to rewrite javascript to C++.
I have problem with this line:
     top.controllers.appendController(myController);

I don’t know how to get "top" object in c++. Is it part of DOM? If is 
how can I get it.

Any idea is welcome.
PM
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