On modern smartphones with large diagonals, not to mention tablets, very convenient to use for alerts small Windows. From the standard notifications in the status bar, they offer more functionality: you can just brush away unnecessary information, minimize a window (it will remain on the screen in the form of a small translucent box to which you can return later), go to the app or scroll through all the available card notification. With Notice will alert you of missed calls, messages (SMS, email and social media), upcoming events calendar, etc.
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