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One of the primary new features of AS 7 is the ability to manage multiple AS instances from a single control point. A collection of such servers are referred to as members of a "domain", with a single Domain Controller process acting as the management control point. Domains can span multiple physical (or virtual) machines, with all AS instances on a given host under the control of a Host Controller process. The Host Controllers interact with the Domain Controller to control the lifecycle of the AS instances running on that host and to assist the Domain Controller in managing them.