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Widget toolkits
Widget toolkits are collections of widgets.
GUI applications use widget toolkits for the graphics.
Most systems provide one or more widget toolkits.
Proprietary systems, like Microsoft Windows, Palm OS and Mac OS, provide one toolkit.
Open systems, like X11, provide several toolkits.
Popular X11-based toolkits are Motif (CDE), GTK (Gnome), Qt (KDE).
These toolkits are tied to a specific platform.