How do I specify the JRE i wish to use to Run an Application.

Hi Everyone;
Please bear with me if you read this before.
I have installed java 1.3.1 and java 1.4.1 in that order.
The JRE used by default is java 1.4.1
How do I specify the JRE I wish to use to Run an Application from a command prompt.
Example:
Java -something org.jboss.Main
help ??
Stephen

I was a lil embarrassed. I told my supervisor that the installation of java overwrites the JRE and that's that.
My supervisor took 10 minutes and went through it and found java.exe in the System32 file.
The java.exe file is found in guess where "C:/WINNT/System32/" folder how nice. C:/WINNT/System32/ is in the path. Not only that it's the first entry in the path. So when I execute java it is not using java.exe any one of the java files that I got from the java website.
So I don't have any control over the version.
Oh well;
That's life. That's 1 for my supervisor.
Stephen

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