title: Bind Escape key in Tmux
body: <p>Since I have my <kbd>Caps-lock</kbd> key mapped to <kbd>Esc</kbd> (due to Vim), I'd also like it in tmux.</p>
  
  <p>Specifically, I'm trying to set <kbd>Esc</kbd> + <kbd>a</kbd> as the prefix:</p>
  
  <pre><code>set -g prefix Escape-a
  </code></pre>
  
  <p>However, this isn't working, and I get the error <code>bad key: Escape-a</code>. Is this because <kbd>Esc</kbd> is not a modifier key? I'd really like this to work, as <kbd>Esc</kbd> is on the home row and very convenient to use.</p>