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Creating MDI Forms

All the projects you've created so far have been single-document interface (SDI) projects. In SDI programs, every form in the application is a peer of all other forms; no intrinsic hierarchy exists between forms. C# also lets you create multiple-document interface (MDI) programs. A MDI program contains one parent window (also called a container) and one or more child windows. A classic example of a MDI program is Microsoft Word 95 (200 behaves slightly different, depending on how it's set up). When you run Word 97, a single parent window appears. Within this parent window, you can open any number of documents, which appear in child windows. In a MDI program, all child windows share the same toolbar and menu bar, which appears ...