Embed a 3rd-party JApplet in a Swing GUI & pass it parameters

There's a third-party applet that I'd like to embed in my Swing application. Basically, I'd like it to be just another panel. This applet makes use of many parameters, e.g.

final String config_filename = getParameter(XXX);

I've seen lots of documentation about how to send parameters values via HTML, but how do you do it via code (or perhaps property files)? Any help would be appreciated!