The Difference between global collision and local collision

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#1

I dont understand How do you determine it is global collision or local collision ? 

and what is the Difference?

#2

This document explains it, check it out: http://docs.coronalabs.com/daily/guide/physics/collisionDetection/index.html

#3

This document explains it, check it out: http://docs.coronalabs.com/daily/guide/physics/collisionDetection/index.html