title: Can I map Alt key in Vim?
body: <p>I tried to map &lt;Alt+D&gt; to &lt;Ctrl+D&gt; by adding the below line to <code>.vimrc</code>, but it doesn't work.  I checked the .vimrc is loaded by Vim.</p>
  <p><code>map &lt;Alt-D&gt; &lt;C-D&gt;</code></p>
  <p>Is there any error in this mapping?</p>