title: questions about IIS application pool configuration
body: <p>I have some questions about IIS application pool configuration.<br>
  I know that  idleTimeout specifies how long a worker process should run idle if no new requests are received and the worker process is not processing requests. After the allocated time passes, the worker process should request that it be shut down by the WWW service (taken from <a href="http://www.iis.net/ConfigReference/system.applicationHost/applicationPools/add/processModel" rel="nofollow">here</a>). My question is when and how the worker process starts when a request arrives after it shut down?</p>
  
  <p>Other question is what is the difference between application pool recycling and between shut down? Does it better to recycke instead of shut down and then start again?</p>