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what is Responder chain in iPhone SDK ?? How it works ?

Matrix
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    This is your 5th Question in 2 hours and none of them is quite specific. You might want to consult the official documentation more closely before you start asking questions. – Philipp Schlösser Sep 22 '10 at 11:47
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    It's also a duplicate. Sigh. http://stackoverflow.com/questions/3768602/what-actually-is-file-owner-and-first-responder-in-iphone-sdk-xcode – dannywartnaby Sep 22 '10 at 12:37

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See the documentation:

If the first responder [to an event or action message] cannot handle an event or action message, it forwards it to the “next responder” in a linked series called the responder chain. The responder chain allows responder objects to transfer responsibility for handling an event or action message to other objects in the application.
If an object in the responder chain cannot handle the event or action, it resends the message to the next responder in the chain. The message travels up the chain, toward higher-level objects, until it is handled. If it isn't handled, the application discards it.

Georg Fritzsche
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