2.5 Window System Keys
Keys that are processed by the window system never make it into your program. For example, Alt+F4 on many window systems closes the active window. The window manager invokes the appropriate action, and the key is consumed. The list of system key sequences is not only platform-specific; it is window manager-specific. Because there is no standard window manager API to query and intercept window system keys, there is generally nothing that can be done to prevent this behavior. In any case, overriding system keys is not something your application should do.
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