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In most computer applications, a “file”—a named entity stored in a specific location—contains a single document. The document, whether a letter or book chapter or dining menu, is one size and usually covers one topic. Think of a picture file from a digital camera or a word processing file.
In QuarkXPress, however, a file can be more than a single document. A QuarkXPress file is called a project, not a document, and it can contain multiple documents called layouts. Layouts can be different sizes—so the same project file can contain business cards and letterhead, for example—and they can be for different media. QuarkXPress can produce print, Web, and interactive (Flash) layouts, all of which can be stored in a project file.