GWT or SmartGWT file download

I need to be able to call a server ervlet from my GWT+SmartGWT client side application and download a file. From this post, people mentioned using "HiddenFrame" and "RPCManager". But I haven't used it before.

Has anyone had experience with that?

Thanks a lot!
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In GWT you can simply call, "_self", "");

Or you can add native method to use:
    public static native void redirect(String url)/*-{
    window.location = url;

to redirect or to open in new window:

    public static native void openNewWindow(String url)/*-{

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Java EE

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