From an IIS perspective, a web directory represents a website that has an application pool. As we are talking about a pool of applications, then it is understood that there is more than one application. From there, each application in the application pool is supported by the same worker process. This means that a worker process that serves an application pool is separated by another worker process that serves another application pool. Thus, if one web application does not work then that does not affect the applications that run in other application pools. To access an application's pool worker processes select Application Pools, then from the Actions pane on the right-hand side of the IIS window select Advanced Settings as shown in Figure 5.7:
