How to detect that i am already running a java program

hi
i am writing this java program. my problem is i don't
want to run more than one program at any time, so i
need a way to detect whether I am already running the program whenever I want to run the program.
Is there any way to do this in java ?
thanks for you help

Look at this thread:
http://forums.java.sun.com/thread.jsp?forum=31&thread=169912

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