Описание тега w3wp
NoneW 3wp is an Internet Information Services (IIS) worker process. It's a windows process (w3wp.exe) which runs Web applications, and is responsible for handling requests sent to a Web Server for a specific application pool.
Internet Information Services (IIS) worker processes serve an application pool. They can be in a starting, running, stopping, or unknown state. In IIS 7.0, worker processes are managed by the Windows Process Activation Service.
More information on Microsoft's TechNet.