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Interactive options may be implemented using various techniques, protocols, and standards. For example, one technique, established by the Advanced Television Enhancement Forum (ATVEF), relies on embedding “triggers” into a television broadcast. Triggers allow content developers, broadcasters, or cable operators to insert real-time prompts and user-selectable links into the video stream. Among other information, a trigger may contain a network address, such as a Universal Resource Locator (URL), that defines the location of content for the interactive option.

Added by DJM 12 2021