The rectangular-shaped viewing area on screen that you are working in. In a graphical user interface (GUI), the boundaries of the window can be easily expanded or contracted.
"application window." YourDictionary, n.d. Web. 17 May 2018. <http://www.yourdictionary.com/application-window>.
application window. (n.d.). Retrieved May 17th, 2018, from http://www.yourdictionary.com/application-window