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Multiple Document Interface

Webopedia Staff
Last Updated May 24, 2021 7:49 am

Multiple Document Interface (MDI) is a Windows API that enables programmers to easily create applications with multiple windows. Each MDI application has a single main window, and any number of child windows.All child windows are displayed within the main window.

Although many programmers still use MDI, Microsoft recommends using a newer API called Single Document Interface (SDI).