How to prevent executing more than one client from a machine?

Hi all,
Currently I am doing a client server project in java. The client is java swing. There is a requirement to prevent executing more than one client from a machine.
Now I am relying on socket for this. I listen to a port, say 15000 and when the second session is started it would give an exception at the socket. I know that this a trivial method. Can anybody please suggest a better method. Also is it possible to bring focus to already executing client, if the user tries to execute the client program again in the same machine?
An early answer to this question is highly appreaciated.
Thanks in advance
SSM

Thanks for the suggestion, but I dont think we can use socket for this. And again if we use file for the same as you described, I think it would sometime create a some serious side effects. Suppose after one client session is invoked, the power goes off. In this case the client shut down is not in the normal sequence and hence we cannot remove the file programaticaly. This creates big problem when the user tries to run client again.
I am really interested to know, is there any standard way in java which can be used to achieve this. Also is it possible to give focus to already executing client program if the user tries to invoke the client again.
Thanks
SSM

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How to prevent executing more than one client from a machine?

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