<p>Uses Growl to provide a desktop popup containing the <b>msg.payload</b>. Only useful on the local machine.</p>
<p>Optionally uses <b>msg.topic</b> as the title.</p>
<p>Uses Growl so should work cross platform but will need pre-reqs installed... see <i><ahref="https://npmjs.org/package/growl"target="_new">this link.</a></i></p>
<p>If installing on Windows you MUST read the install instructions ... especially the bit about adding growlnotify to your path... or it WON'T work.</p>