Is it possible to programmatically catch all events on the page in the browser?

In here in says we can:
http://groups.google.com/group/google-web-toolkit/browse_thread/thread/aaf3896af8a10969/13b07a31440532ce?lnk=gst&q=catch+all+events#13b07a31440532ce

But here they say it is easy way in javascript:
http://stackoverflow.com/questions/5107232/is-it-possible-to-programmatically-catch-all-events-on-the-page-in-the-browser

In Java, for AWT and SWT there is an event bus so a programmer can
catch all GUI events without explicitly adding event listener to all
widgets.

Is it possible to programmatically catch all events on the
page in the browser? Even if the developer uses preventdefault or
stopbubbling, can I catch the event?

thanks

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