How to manipulate Windows System Variables using Java

Hi There,
I want to manipulate Windows System variables (e.g. PATH, CLASSPATH) using Java program. Could anyone please let me know how it can be done in Java.
Regards,
Rakesh Nagar

System.setProperty(String key, String value);

More specifically, the CLASSPATH can be reached by:
String classpath = System.getProperty("java.class.path");

W.
PS: This is a recurrent question...

Thanks for your replies...i am aware of the System.get/setProperty. The changes done by System.setProperty are only visible to the current JVM. I want to permanently changes the Windows environment variables.
If possible ? How this functionality can be achieved ?
Thanks in advance
Regards
Rakesh Nagar

Try this :
Runtime.getRuntime().exec("set CLASSPATH=....");
W.