Welcome to JavaRanch.
Not directly. There are a few options for achieving something similar, though.
The applet can manipulate the DOM of the HTML it's embedded in (and possibly other frame son that page) through the Common DOM API. A link to that can be found in the Applet FAQ.The applet could write an HTML file to the local hard disk, and have the browser open that file. It would need to be signed to do that (links about which can again be found in the Applet FAQ).The applet could post the pertinent information to a server-side component (e.g. a servlet), and could then ask to the browser to display a new page off the server that incorporates that information. Do any of these sound like they might do what you're looking for?