CRT (cathode-ray tube)

The display device for computer terminals, typically a televisionlike electronic vacuum tube.
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A security system using video cameras and video recording devices.
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A medium used for telecommunications. It is similar to the type of cable used for carrying television signals.
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A form of media distribution occurring over the Internet (in contrast to more traditional means such as over-the-air or cable TV broadcasts and radio stations). Can also include and is related to videocasting, audiocasting, podcasting, netcasting, Internet television, and IP TV.
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Limiting access to information system resources only to authorized users, programs, processes, or other systems. The mechanism by which subjects are granted or restricted access to objects. It includes hardware, software, and organizational policies or procedures that identify and authenticate subjects, verify authorization to objects, and monitor or record access attempts. The process of allowing only authorized users, programs, or other computer system (i. e. , networks) to access the resources of a computer system. A mechanism for limiting the use of some resource (system) to authorized users.
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