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Examples of systems that support PUIs are [[Mac OS]], [[Microsoft Windows]], [[NEXTSTEP]] and the [[X Window System]]. The latter is extended with toolkits such as [[Motif (widget toolkit)|Motif]] ([[CDE]]), [[Qt]] ([[KDE]]), [[GTK]]+ and ([[GNOME]]).
GUIs that are not PUIs are most notable in [[computer game]]s. Advanced GUIs based on [[virtual reality]] are frequent in research. Many research groups in North America and Europe are working on the [[Zooming User Interface]] or ZUI, which is an advanced but logical outgrowth of the GUI, blending some 3D movement with 2D or "2 and a half D" vectorial objects.
A certain amount of insight can be obtained by comparing noun-verb to verb-noun metaphors. Noun-verb interaction begins by picking an object then telling the system what to do to it. Verb-noun systems tell the system what to do, then pick the object to do it to. In academic and research circles a GUI is often referred to as a [[Direct manipulation interface]]. This term was invented and adopted in the late 80s because it was felt that the term "Graphic User Interface" did not reflect the actual physical or haptic reality of manipulating a mouse or using a touch screen and that it ignored completely the coordinated use of sound effects to support the manipulation of the graphic elements of this kind of user interface. Also, academic and research institutions often work on prototypes of future user interfaces which place an equal emphasis or even more emphasis on the tactile elements of the interface. The "direct manipulation interface" term is usually not presented as an acronym.
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