Here is an easy way to use both Emacs and OS X modifier keys when you are inside Emacs:

Toggle the right-option and function key to switch between using them inside Emacs and using them for OS X.

Addendum:

I used Karabiner to make ENTER send LEFT CONTROL when chorded. I used OS X to make CAPS LOCK be CONTROL . I didn’t change OPTION and COMMAND . I made this change because Emacs couldn’t ignore the key-event when it was coming from Karabiner.

Here is the code:

(help/on-osx (setq mac-control-modifier 'control) (setq mac-right-control-modifier 'left) (setq mac-command-modifier 'meta) (setq mac-right-command-modifier 'left) (setq mac-option-modifier 'super) (setq mac-right-option-modifier 'left) (setq mac-function-modifier 'hyper) ( defun help/toggle-mac-right-option-modifier () "Toggle between passing option modifier either to Emacs or OS X." (interactive) ( let ((old-ropt mac-right-option-modifier)) (setq mac-right-option-modifier ( if (eq mac-right-option-modifier 'left) 'none 'left)) (message "Toggled ` mac-right-option-modifier ' from %s to %s." old-ropt mac-right-option-modifier))) ( defun help/toggle-mac-function-modifier () "Toggle between passing function modifier either to Emacs or OS X." (interactive) ( let ((old-func mac-function-modifier)) (setq mac-function-modifier ( if (eq mac-function-modifier 'hyper) 'none 'hyper)) (message "Toggled ` mac-function-modifier ' from %s to %s." old-func mac-function-modifier))))

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