Here's a pretty good tutorial amongst their developer documentation: http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaFundamentals/WhatIsCocoa/cha

Here's a pretty good tutorial amongst their developer documentation: http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaFundamentals/WhatIsCocoa/chapter_2_section_3.html http://developer.apple.com/documentation/Cocoa/Conceptual/Co...