Japanese uses the word 画面 (gamen) in a software context in many different ways. It might refer to a window, a dialog box, a (web) page, or the computer's physical screen.
The Fifth Edition of the Green Goddess gives the following translation for 画面 in a computer context:
【電算】 〔コンピューターや携帯電話などの表示面〕 a (display) screen.
This, unfortunately, is incorrect [...]
