1. You have no access to any user media on the phone (movies, music, etc) with the exception of the user photos. Even there you have to allow the user to select one at a time.
You can of course play your own media.
In any case if you call another app (such as Mail) your app will close and it will be up to the user to restart it if they wish when done with the other app.
2. Yes, you can draw whatever you want. There's no automatic 'graphing' functions but you can draw any sort of lines ,arc, colors, etc so that's not an issue.
3. The only way to get data from the iPhone is via email (which doesn't take attachments) or wireless directly to the other computer or to a server. Apps have no access nor control over syncing or using the USB. iTunes by default backs up documents from the apps but not in a normal format that can be opened and worked on by users. Creating a text or CVS(?) file for Excel itself shouldn't be a problem.
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