How to close a browser window opened by Java Web Start

Question

I have a java application that works like an applet. Since plugin support goes away in the browser, we are trying to understand how much the applet will run in Java Web Start.

However, our application currently opens additional browser windows using appletContext.showDocument (URL, target).

Java Web Start, unfortunately, ignores the target, so we cannot name this window (therefore, we also cannot close the window later).

Is there a way, within Web Start, to support the handle to all programmatically open windows so that they can be closed programmatically later?