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Reference.org
Xerox Development Environment
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<p>The Xerox Development Environment was one of the first <a href="/facts/Integrated_development_environment/jbEINSQf">Integrated development environments</a> (IDEs). It was first implemented on the <a href="/facts/Xerox_Alto/6pjFTD0A">Xerox Alto</a> in 1977. </p>