How to get reference to a served file after submitting a form?

Hi,
There are pages that after you submit a form, a file of some sort is pushed
from the server. Under a browser environment, you are prompted to choose how
to deal with it.
As DOM is about the automation of http handling, there should be a way to
imitate the interchange between the user agent and server.
I tried stand alone script with
xmlhttp.open ("PUT", action-url, false);
xmlhttp.send(form-name-value-pairs);
the responsetext is but the form page itself.
I tried using the MSHTTP and invoke a "click" event on the submit button,
the page is opened in the browser. 
Looking up W3 and there is event-stream, but no likely the scenario, which
is new and my problem should an old one.
I have been working over one week but still at nowhere to find a way to get
the file served.  Can gurus here shed me some light?
Much thanks in advance.

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Received on Tuesday, 6 October 2009 12:29:06 UTC