The launch bar gives you one-touch access to commonly used apps (and other shortcuts). 
	 You can replace the apps on the launch bar with the ones you often use. 
	 
 
  
 
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		  Press and hold the app you want to replace, and then drag it out to 
			  . .
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		  Tap  to go to the 
			 Apps screen. to go to the 
			 Apps screen.
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		  Press and hold an app, and then drag it to the empty slot on the launch bar.