What is a characteristic of a Multiple Document Interface (MDI)?

The characteristic of a Multiple Document Interface (MDI) is that users can open multiple windows within the same application. This design allows users to work on several documents simultaneously without needing to launch new instances of the application for each document. Each open window in an MDI represents a different document or a different view of the same document, all contained within a single parent application window.

This structure is particularly beneficial for tasks that require multitasking or comparing content across different documents, as it keeps all related work organized within one main application interface. Thus, users can easily switch between documents and manage them more effectively compared to having multiple, separate application instances open.

MDI contrasts with a Single Document Interface (SDI), in which only one document can be opened at a time in a single instance of the application. The other choices describe characteristics that do not apply to an MDI setup, helping to clarify the functional advantages of this interface design.