How to set the Environment Variable

I'm going through a tutorial on how to create an application and run from the command prompt. I have finished installing my jdk 6 Upadate 5 but i don't know how to set the Environment Variable for the javac compiler and the java interpreter to find my program.
I have created an application called "ExampleProgram" and have saved it on drive C:. How do i set the Environment Variable so that the "javac" compiler and the "java" interpreter can find it

gyesa_say wrote:
I'm using Windows XP Service Pack 2.A very bad choice to go with Windows. Personally I prefer Linux.
I Google and had several information on how set it, but i tried all of them and none seem to work.I typed "how to set environmental variable in winxp" in Google and the very first link provided all the information I needed (you need). These things will make much more sense if you go through it yourself rather than having someone else spoon-fed you the answer.

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