Compositing window manager
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In X Window System, a compositing window manager is a unified X window manager and compositing manager program. The unification facilitates graphical compositing effects that react to window management events such as appearance of new windows. Although such a combination was present in the stable 2.7.0 release of Metacity in February 2004, the first widely-publicized compositing window manager was released as part of Xfwm in January 2005. The first published implementation using OpenGL was the Luminocity prototype. As of 2006, current programs using OpenGL include Compiz, which was created at Novell, and Metacity for GNOME, and the fork of compiz, Beryl, which is becoming more and more popular. Despite claims to the contrary, the KDE Project has, as of September 2006, not implemented similar features in Kwin. This however remains a goal for KDE 4. Other window mangers, such as Xfce4, can act as compositing managers as well. At the moment, Xfce's window manager has only basic support for compositing (such as a partially transparent panel).
List of compositing window managers: