It comes from NeXTSTEP, text fields were given several emacs compatible keystroke editing commands as part of the key bindings for NSTextField and NSTextView.

It comes from NeXTSTEP, text fields were given several emacs compatible keystroke editing commands as part of the key bindings for NSTextField and NSTextView. You can modify the default keybindings and even add more emacs compatible keystrokes if you find it helpful and most Cocoa apps will inherit the new keystrokes: http://www.hcs.harvard.edu/~jrus/site/cocoa-text.html http://www.hcs.harvard.edu/~jrus/site/cocoa-text.html (it's a good article that also has some interesting info on Input Managers and modifying keyboard layouts) drdrang wrote an article that linked to several other good sources on the subject: http://www.leancrew.com/all-this/2011/11/capitalization-keybinding/ http://www.leancrew.com/all-this/2011/11/capitalization-keyb...