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A Multiple Document Interface is an application style that allows users to open multiple windows (called sheets) in a single window (called MDI Frame) and to move freely among these sheets. The PowerBuilder development environment supports a Multiple Document Interface, as you can open several painters at the same time and swap between them as required:
In the above picture, we have the file editor, library and database painters open and moreover, you can see from the Window menu option, in what order the painters were opened and which is currently selected. You can move between the windows by simply clicking on the window you want or by selecting the appropriate entry from the Window menu. When you move the focus from one window (sheet) to another, menu bar and the toolbar change, to reflect the options available for the active sheet (window).
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