Some basic development queries...please throw some light

Hi All,
I have certain queries regarding the following iPhone SDK support in 3rd party app:
1) Can capture snapshot while showing the Live Video in my application?
2) Can programatically enable/disable the audio?
3) Can iPhone library be accessed programmatically so that I can store an image from recived from the server to user defined location.
4) Application should be minimized to the tray, when event triggers the programming window resumes.Can we do this ? I think back ground 3rd party application are not allowed in iPhone.
5) Playback control, to play, pause, next track, previous track etc. Can this be done using SDK.?
6)Is it possible to access iPhone file system using SDK.?

1-5 No
6 Only for your own app sandbox

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