Disallow running multiple instances of the same web start application..

on the client? I have an application that is launched on the client by clicking on the link to the JNLP file. The problem is that I don't want the application to launch twice if the user clicks the link twice. Is there a way to keep web start from running multiple instances of the same app?
I don't want to just disable the button after it is clicked because then the user won't be able to get back in if they need to.
Any help out there?
Thanks,
Melanie

The way I do this is to try connect to an obscure port number on the localhost at startup.
if this connection succeeds I assume the app is already running. otherwise the program continues and registers as a server at that port number.
I actually take this a little bit further by registering a web server at this port (I use the Brazil server), That way if the program finds an instance of itself running it can send a message to the web server and ask the program to do something (like start another window if,for instance you wanted to allow this but only within the same VM).

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    The methods on the bean operate against DB tables.
    Q: Can I deploy multiple instances of the same
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    The method calls are all enclosed within a single
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    Im using JBoss 3.2.1 on Solaris, so Im not sure
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