How to Customize Your Linux Desktop - From GTK to Compiz

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http://www.maximumpc.com – Unlike Windows, Linux has several different widget toolkits. The most well-known widget engines are GTK+, (distributed with GNOME) and QT. (pronounced “cute”) Widgets are the various elements which make up a program's GUI: scrollbars, arrows, checkboxes, etc. However, take note that QT or GTK widgets are not the same thing as desktop widgets. (HowTos)