Topic on Talk:Metaphysical App

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I was trying to be clever with the title. I used Killer App in reference to the term 'killer app' about an application or some piece of software whether an program or game is so popular and essential that one would buy the hardware to use it. Then there is the word 'killer' as in the slang term which is used as an adjective for someone or something that is cool, impressive or exciting which the apps in the examples shows.

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