How i can recognize big tap on the iPhone back? - iphone

I want to recognize a big tap on the iPhone back using accelerometer? How i can do this?
Thanks the answers,

An example from Apple.

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It is possible to record video in iPhone device screen off mode?

Am working in iPhone device camera based iOS application. I have one requirement to record video from our application even the device screen is off or in locked. I don't have iPhone, iPod and iPad. And also i don't know it is possible to record video in these conditions. Cound you please give me any idea on this? Looking forward your help. Thanks in advance.
No this is not possible. There's no other way to achieve this.
In some countries it's against the law to even take picture without sound effect, such as Japan for example. No wonder Apple don't allow to shoot pictures from locked screen.

Invoking application programmatically by text gesture on lock screen - iPhone/iPad

How can i place my application icon on the lock screen of the iphone programmatically(something like the default camera button next to slide lock). Is it possible ? If so can any one guide me on this ??
EDITED
Hi all.. thanks for replies.. after seeing your replies i understand that this is not possible and its possible in jailbroken devices.. or is it possible to invoke my application through some gesture on lock screen ???
I dont think it is possible. I understand you want to implement something like android interface, but apple has its UI standards and has restricted access to that.
For Jail broken Device:
I'm not sure whether it work or not.
Please check these links:
You Tube 1
You Tube 2
Note : Possibly it is for Jailbroken devices. Also I didn't checked these video's because it's restricted in our company :(
This is not possible as Apple does not allow that.

Screen recording in iphone

I want to make a screen recorder with iphone.
Is it possible to do that?
If yes how can i implement a screen recorder with xcode, anybody can help me.
I know how to implement(i mean the logic),that is add pictures to a video file in a regular interval.but how can i do this with iphone sdk
Help me...
Assuming you mean a standard iPhone which is not jailbroken:
No, you can't. You could write an app that captured images of its own display when running, but you can't capture the screen in general (e.g. the home screen, or other apps' screens). It's not the sort of software Apple would allow, even if you found a way to hack around it (which I imagine wouldn't be possible).
What about this? It seems to indicate that video screen capture and saving (using the UIGetScreenImage function) is now allowed by Apple.
http://www.tuaw.com/2009/12/15/apple-relents-and-is-now-allowing-uigetscreenimage-for-app-st/

How to Implement slider button

I'm talking about the "slide to unlock" button on iPhone. Any ideas how to go about implementing one in my own iPhone app? I don't see it as a control in IB?can any one suggest me?Thank You in advance...
See these posts
UISlider, slide to unlock
Slider which helps to unlock the iPhone
Might not be such a good idea...
http://www.geek.com/articles/mobile/slide-to-unlock-patented-20100818/

Scrolling the iphone simulator

I am a beginner in iphone development, and I want to make scrolling in the iphone simulator.
How can I make it possible? Can anybody give me code for it?
You should look into the ScrollViewSuite example that Apple gives then. They use scroll views in a couple different ways to show off what they can do.
More information here: http://developer.apple.com/iphone/library/samplecode/ScrollViewSuite/Introduction/Intro.html