How to start a Jar file in another directory?

Hello!
I have 2 questions, hope someone can help me...
1)
I have a GUI which is placed in C:/java/tmp/GUI.java. When I run this program I want it to start runing a JAR file which is placed in d:/tmpdir/app.jar. How do I do this?
2) How can I get the directory a program is running in?
/Clabben

Hello
Yes Rana the main method is placed in GUI.java, and I want this method to start/run the app.jar. The problem is just that these are placed in different directories AND how do I "start/run" the app.jar? The app.jar has also got a main-class. So you can click on it to run it, but I want the GUI.java to do this . Do you, or anyone else, have some code example?
/clabben

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