The problem is that one window can access the DOM of another window. And it expects to be able to make blocking calls to the other DOM in a reasonable way (eg calling window.alert() on some other window). So either all DOM access needs to be threadsafe, with locking and so forth (a performance issue), or we need some setup where we put window groups on different threads, or something.
So this is the reason why - among others - with popuped alert one cannot access the main window if I understand it well? Sometimes the "for in alert" in page is the quickest and easiest sollution to find info about some object (in several browser in the same time), but you can easily get catched in almost infinit loop (onkeyup on input field is the good candidate ;) and then bye-bye all other open windows (and work)...
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