Disabling app on the iPhone?

Is it possible using the iPhone SDK, to disable an application unless a pin code is entered which will re-enable it?

Ie: You run an app > it disables the ipod app > if the correct password is entered, it re-enables it?开发者_Go百科

Is there a function in the SDK to do so / what is it called?

Otherwise how else would be best to go about doing it?

Thanks!

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This cannot be done in the iOS SDK.