(require 'smex)
(smex-initialize)
(global-set-key (kbd "M-x") 'smex)
(global-set-key (kbd "M-X") 'smex-major-mode-commands)
(global-set-key (kbd "<menu>") 'smex)
(global-set-key (kbd "S-<menu>") 'smex-major-mode-commands)