Creating Application Pools
When you run IIS 6.0 in worker process isolation mode, you can isolate different Web applications or Web sites in pools, which are called application pools. An application pool is a group of URLs that are routed to one or more worker processes that share the same configuration. The URLs that you assign to an application pool can be for an application, a Web site, a Web directory, or a virtual directory.
In an application pool, process boundaries separate each worker process from other worker processes so that when an application is routed to one application pool, applications in other application pools do not affect that application.
By using an application pool, you can assign specific configuration settings to a worker ...