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Cocoa’s default key bindings are here: file:///System/Library/Frameworks/AppKit.framework/Resources/StandardKeyBinding.dict

The file ~/Library/KeyBindings/DefaultKeyBinding.dict allows you to override the defaults.

Here’s Apple’s documentation on this topic:

Here’s everything I’ve figured out about the file format so far:

Syntax notes: Modifiers: ^ : Ctrl $ : Shift ~ : Option (Alt) @ : Command (Apple) # : Numeric Keypad

 Keycode formats:
     \NNN   = Octal
     \UXXXX = Hex
 Printing characters (including space) can be specified by 
     using the character itself.
 Keycodes for non-printing keys:
     These are equal to the ASCII codes:

     Backspace:  \U0008
     Tab:        \U0009
     Escape:     \U001B
     Enter:      \U000A (newline) or \U000D (cr)?

     Other non-printing keys are represented by "unicodes" 0xF700-0xF8FF.  The
     complete list can be found in the NSEvent.h header file.  The availability of 
     various keys will be system-dependent.

     Up Arrow:   \UF700
     Down Arrow: \UF701
     Left Arrow: \UF702
     Right Arrow:\UF703

     F1:         \UF704
     F2:         \UF705
     F3:         \UF706
     F12:        \UF70F
     F35:        \UF726

     Insert:     \UF727
     Delete:     \UF728  (also ASCII code \177)
     Home:       \UF729
     End:        \UF72B
     Page Up:    \UF72C
     Page Down:  \UF72D

     Print Screen: \UF72E
     Scroll Lock:  \UF72F
     Pause:        \UF730
     SysReq:       \UF731
     Break:        \UF732

     Menu:         \UF735
     Help:         \UF746

 Sub-structure syntax:
     Nested dictionary (for multi-key bindings like ^X^S):  
         { key1 = val1; key2 = val2; ... }
     Nested array (for binding to a sequence of commands (??)):
         ( elt1, elt2, ... )

 The commands (like "pageUp:" and "moveToEndOfLine:") are Action methods
 of the NSResponder class.

You can enter the code for any key by pressing Ctrl-q first. For example to set a keybinding for F1 you would hit Ctrl-q, then type F1 to insert the squiggley symbol that corresponds to the Unicode value for F1 into your keybindings file.

You can bind any standard NSResponder message and expect it to work. selectLine: and selectWord: are quite useful…