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Wiktionary:
2. (computing) the use of a graphical user interface divided into windows
NeWS was an early windowing system.

ülevaateid
http://www.ques10.com/p/22047/what-is-1windowing-2clipping-3window-4viewport/

https://en.wikipedia.org/wiki/Windowing_system

https://p2k.utn.ac.id/IT/en/3069-2966/windowing-system_16409_p2k-utn.html