Java plugin not going away when browser closes

Not really a huge problem, but just a question. At my work, we've developed an insurance card scanning applet and on one of the machines we have installed it on the plugin doesn't go away once all of the browsers are closed. The machine in question is a Windows 98 2nd Ed box and the plugin is ver 1.3.1_02. We have the software installed on 6 other similar machines at the site and none of them have the problem. On Windows 2000/XP/NT it works fine too.
What sort of things could cause that? Browser settings or some other settings? Just curious.

Thanks, that's sort of what I thought it might be. I didn't create the applet but I get to fix it. :)
I've also found that the applet is leaving a file handle open somewhere. Could that be why it won't die properly? It's not that large of an applet and it's not multi-threading but we do use JAI and JNI along with communicating with the browser through JSObject which I've read can cause trouble. Do you know of any good tools that could help me track down loose threads/file handles in the applet? Or techniques to clean up properly?
Thanks for the help.

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