Help Please: Do I need to set Classpath?

Hi friends,
I installed JDK 1.4 on Windows, do I need to set up classpath after installation? How to do it?
What if I install JDK on Linux? How to set the classpath?
This puzzles me a lot, any response will be greatly appreiated!
THANKS!!!

Windows: probably not, but if you do it depends on the version of Windows. http://forum.java.sun.com/thread.jsp?forum=54&thread=246067

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