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Hub is one of the three main concepts underpinning BlackBerry 10 (along with Peak and Flow).
BlackBerry Hub is the integrated inbox with all your messages and communications including calls, text messages, work email, personal email, social networking updates or calendar notifications.
If that all sounds a bit much, you can filter the inbox by service, so that you're only looking at one of those categories, for example.
Peek refers to the way in which you can 'peek' at your Hub and notifications without leaving whatever you were already doing.
For example, in the picture above, swiping up from the centre-middle of the screen to the middle-right hand side of the screen activates Peek and shows notifications waiting in the Hub. The platform also uses a Peek-like dissolve animation as you swipe from the bottom to the top of the device to unlock it.
Flow, on the other hand, is BlackBerry's name for the way in which people navigate the BlackBerry 10 OS, flowing from task to task, peeking at things along the way.
Quick, uniform access to features is something BlackBerry has paid particular attention to with BlackBerry 10, and as such, swiping from the left-hand side, bottom or top of the screen results in a predictable action.
For example, swiping down from the top gives you access quick access to system shortcuts, regardless of whether you're using an app or on the home screen (pictured above).
Similarly, swiping from the left-hand side brings up feature options of any open app, for example, allowing you to select between local, SD card and Dropbox storage within the File Manager app.
And swiping up from the bottom centre of the screen always returns you to the Active Frames screen and displays the shortcuts to the phone dialler, camera and universal search box (visible at the bottom of the screen in the picture above).