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This is vitally important, because just looking through Google for "How to create a Facebook app" will get you very in-depth tutorials on obsolete methods.
In this way, a BlackBerry app cannot work directly on an iPhone, for example.
This changed with the App Store and the iPhone 3G.
We may illustrate the first method by taking a case discussed by Helmholtz (Sensations of Tone, app. xvi.) where the two sources are reeds or pipes blown from the same wind-chest.
In general, you will need to code the app separately and according to a different set of standards depending on the phone that you'd like to use.