If you use Emacs in a FreeBSD console (cons25), you may be disappointed by the default keymap, in which <kbd>Alt</kbd> doesn't act as <kbd>Meta</kbd>, among other things.  Unfortunately, the Emacs-friendly keymap that comes with FreeBSD is horribly out-of-date, and doesn't quite do what I want.  So I've created my own [http://edward.oconnor.cx/config/.freebsd-keymap keymap], essentially a blend of <tt>us.emacs.kbd</tt> and <tt>us.pc-ctrl.kbd</tt>, which acts the way I want it to.  Don't forget to disable <code>normal-erase-is-backspace-mode</code> if you decide to use it.

If you'd like to make use of the Windows and Menu keys, you could do something like this:

{{{
;; Make the left Windows key into a Super modifier
(define-key function-key-map (kbd "ESC [ J")
  'event-apply-super-modifier)
;; Make the right Windows key into a Hyper modifier
(define-key function-key-map (kbd "ESC [ ~")
  'event-apply-hyper-modifier)
;; Make the menu key actually be a menu key.
(define-key function-key-map (kbd "ESC [ }") (kbd "<menu>"))
}}}

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ConsoleKeys CategoryKeys