Document Architecture
http://developer.apple.com/documentation/Cocoa/Conceptual/Documents/Documents.html
Pasteboard (note the sections on implementing copy/paste,specifically
cut)
http://developer.apple.com/documentation/Cocoa/Conceptual/CopyandPaste/CopyandPaste.html#//apple_ref/doc/uid/10000068
Undo Architecture
http://developer.apple.com/documentation/Cocoa/Conceptual/UndoArchitecture/UndoArchitecture.html#//apple_ref/doc/uid/10000010
Cocoa Event Handling
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