Certain application's JVM instance

Hello,
I didn't really know in what section to post this thread, so I figured this was the best one. If it is in the wrong section, notify me, and I will post it in the correct section.
I am making an application in C which requires getting the process ID of a specific JVM instance. The problem isn't getting the process ID, but it's differentiating a VM instance from another. How would I go upon doing this?
Thanks

Wow! Can't get much easier than that :)
Thanks alot!
EDIT: The application I am trying to get runs as an applet. So unfortunately, every applet prints: sun.plugin2.main.client.PluginMain
Any ideas?

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