How to avoid multiple copies of the same application in Web Start cache?

We have an environment where there are several HTTP servers carrying the same Web Start application.
Is there any way to prevent Web Start from installing another copy of the same application in a client machine's cache if the user hits an HTTP server that is not the one the application was already installed from?

There is no way WebStart can know that an application from one server is actually the same as an application from another server, so I don't think this is possible.

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