virtual processor root (n)~ In the Concurrency Runtime in the Resource Manager an abstraction of a physical processing resource. To enable oversubscription of hardware threads multiple virtual processor roots can map to one physical processing resource. virtual registry (n)~ The subsystem that intercepts and redirects registry requests for keys and values from application processes running in a virtual environment. The redirection is based on the registry information defined in the application package and created or modified through interaction with a virtual application.