Using COM to position browser window?

[mcrbids]

I'm using PHP-GTK on Windows, and am calling the following:

$browser=New COM("InternetExplorer.Application");
$browser->Visible - true;
$browser->Navigate($pdffile);

This lets me display a pdf file just generated by the PHP-GTK program, but the browser window often shows behind the PHP-GTK program window, causing confusion.

Is there something like

$browser->BringToFront(true);

or something? I can't find one. Also, if you know a good reference for this kind of stuff....