Usually, when you distribute applications using a special method, when viewing the application in the iTunes interface, the image of the application is not displayed. However, if you put a copy of the 512 Γ 512-pixel PNG of your icon in your application suite and name it iTunesArtwork without a file extension, it will be used by iTunes.
To deploy the application to your users using the ad hoc method, you need to create a distribution certificate, register any devices that you plan to use, and create an ad hoc Provision profile in the iPhone developer portal.
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