1º_ Opening in a building through which light can enter and, in principle, ventilation as well. Some also allow people to pass through but are called "window doors". They are usually covered with opaque shutters and movable frames with glass panels, to control air access and lighting. The etymology is related to the word wind. 2º_ By the above, any embedded frame that allows an image to be seen through it, and the concept is extended to screens with information (PIP), or also to a situation that presents a momentary change and that allows some action before reappearing.
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