title: How to avoid the message of "server-start" while opening another Emacs session?
body: <p>I have a line <code>(server-start)</code> in my <code>.emacs</code> for some reasons. Everything is fine when I launch a first session of Emacs, but when I open anther session, there is a buffer which shows:</p>
  
  <pre><code>Warning (server): Unable to start the Emacs server.
  There is an existing Emacs server, named "server".
  To start the server in this Emacs process, stop the existing
  server or call `M-x server-force-delete' to forcibly disconnect it.
  </code></pre>
  
  <p>As I quite often open several Emacs, I am wondering if it is possible modify `.emacs' file so as to avoid this message in the beginning.</p>
  
  <p>Could anyone help? Thank you very much!</p>