How to use your Samsung Galaxy S4 [Tips and Tricks] *FAQ answered in 'Description'.

The gesture sensor (purple light) blinks due to camera picking up the infrared waves. not seen by naked eye.
here is a great video to help you with your Galaxy S4.
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Click Here to see how Group Play works:    • How to Use Group Play on Samsung  
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UPDATE: in terms of adding apps in multi window..it takes certain coding to write those apps. Once the 3rd party companies do that, the per carrier accepts or denies those. Unless you root your phone.

Update: if you see 6 shooting modes compared to 12, you are in Easy Mode. Switch your home screen mode to standard.
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