title: p:commandButton with immediate=true
body: <p>What action is taken when I declare <code>immediate="true"</code> in command button? The documentation says</p>
  
  <blockquote>
    <p>Boolean value that determines the phaseId of the action event, when true actions are processed at "Apply Request Values", when false at "Invoke Application" phase.</p>
  </blockquote>
  
  <p>However, I don't understand it. Can someone please explain this?</p>