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A high-gain screen can be made as a sandwich of a hologram and a retroreflective screen material. When a hologram is used in front of the screen instead of the screen material alone, the position of high-brightness viewing can be moved to any desired angle rather than being directed back along the projection beam.
A nationwide internet telephony network is described that uses H.323 gateways distributed around the country to provide customers with local telephone access to application services hosted at a central data center. A key technology that enables deployment of the network is automated configuration management. The configuration management system includes a(More)
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