sterApp</code></b>
if it is not already started.
</p>

<p>
<code>SimpleClusterApp</code> starts three actor systems (cluster members) in the same JVM process. It can be more
interesting to run them in separate processes. Stop the application in the
<a href="#run" class="shortcut">Run</a> tab and then open three terminal windows.
</p>

<p>
In the first terminal window, start the first seed node with the following command (on one line):
</p>

<pre><code>
&lt;path to activator dir&gt;/activator 
  "runMain sam