Discussion:
http://stackoverflow.com/questions/9425706/share-data-between-two-or-more-iphone-applications?rq=1

Essential answers:
http://stackoverflow.com/a/27616985/471673
http://stackoverflow.com/a/27730754/471673

Essential keywords:
App Groups,
-[[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:]

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