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TeachText was derived from the Edit application,[4] which was a simple text editor for the early pre-System 6 Apple Macintosh computers. Edit was included with early versions of the basic system software[citation needed] to demonstrate the use of the Macintosh user interface, and as the primary code editing tool for the original 68000 Macintosh Development System. While Edit was a tool and demonstration program for developers, TeachText was used mainly by users to display ReadMe documents.