Unable to use javac or jar commands

Hi all,
I've been using my IDE to compile and run my programs. However, when I want to use -javac or -jar commands in my command prompt, it doesnt work.
The error is :
'javac' is not recognised as an internal or external command,
operable program or batch file
Same goes for jar
-java works for me. Why is that so? I hope anyone can give me solution.
Note : I'm on windows vista
Another question :
I've been using JMF (Java Media Framework) to develop a simple audio player. However it can be run on my pc. What happens if I try to run the program at another pc, will it still work? The other pc will not have JMF installed, but will have JRE to run java apps. If it cannot be run on the other pc, is there any solution?
Thank you for your kind assistance.
Edited by: TrAnScEnD3nT on Sep 30, 2007 10:18 PM
Reason : Sorry I have mixed up java and javac, I've corrected it.

Mainta? That's my favourite!This time...
In very general terms the PATH is a system variable that is maintained and used by your operating system or shell (not Java) to locate executable files. So, for instance, if you type the command:
>writeit will be the PATH that Windows uses to locate the write.exe word processor.
The directory containing the Java tools - java.exe, javaw.exe, jar.exe, appletviewer.exe etc - very commonly goes into the PATH variable.
The classpath is a list of locations that Java uses to locate classes (as you said). It is used by Java and not your operating system. It is commonly (but not always) set each time you use one of the Java tools. There is a -cp switch that lets you do this. For instance a common command to compile a file would be
>javac -cp . HelloWorld.javaThe "-cp ." bit means "the classpath shall be the current directory".
Setting a particular classpath does not, in general, affect the "built in" classes of Java, so you don't have to worry about this. If you search the documentation that came with your distribution you will find the exact rules for "how classes are found": but to begin with the important thing is that any classes you write must be included in the classpath which can be specified as part of the commands to compile or run your code.

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Unable to use javac or jar commands

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