An operating system shell provides on a display screen a graphical user interface through which a user interacts with the operating system. The operating system shell provides a background noisy display rendered on the display screen in accordance with a background physical lighting model, and an ambient notification rendered over at least a portion of the background noisy display to provide a user notification. The ambient notification is rendered in accordance with an ambient notification physical lighting model that is different from the background physical lighting model.


< Security-related programming interface

> Controlled non-proportional scaling display

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