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Enlightenment, also known simply as E, is a free software/open source window manager for the X Window System which can be used alone or in conjunction with a desktop environment such as GNOME or KDE. It has a rich feature set, including extensive support for themes and advanced graphics without sacrificing good performance. As such, Enlightenment is sometimes deployed as a substitute for a full desktop environment. In November 2007, retailer Wal-Mart started selling US$200 computers based on a Linux Operating System using Enlightenment as the default window manager.