what is the meaning of the Object window['0'] and window['1'] in javascript

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I'am a beginners of javaScript,and i really want to know what does the Window['0'] means. I guess it may be connected with frame element of html,but how and i can not find answer in the book Professional JavaScript for Web Developers 3rd Edition.

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https://developer.mozilla.org/en-US/docs/Web/API/Window window[0], window[1], etc. Returns a reference to the window object in the frames. See Window.frames for more details.

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