This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
You have to include a JDesktopPane in your Frame. The JDesktopPane is able to deal with JInternalFrames, which you can add to it. You should try to make all functions like cascading with a DesktopManager. If you want to know more, please have a look to the Swing Tutorial from Sun. You will also find some good information in the API. Hope that helps Rene