title: Use Alt key as Meta in emacs
body: <p>Somehow the emacs I'm using doesn't treat Alt as Meta. It only uses ESC for it. If I press Alt+x it will tell me "A-X" undefined. I tried to figure out how to map it to meta but got no luck on the web because in most of results from my search people take Alt as Meta by default. I guess something like this should work:</p>
  
  <p><code>global-set-key Alt(?) 'meta</code></p>
  
  <p>but I'm not sure how to represent Alt in lisp.. any help? Thanks!</p>