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Audio broadcasting, audio teleconferencing, telephone communication services, electronic transmission of data, documents and messages via computer terminals, network conferencing services, providing multiple-user access to a global computer information network, providing on-line chat rooms for transmission of messages among computer users concerning business, sales, marketing and education, providing on-line electronic bulletin boards for transmission of messages among computer users concerning business, sales, marketing and education, video teleconferencing, telephone voice messaging services, video broadcasting and video on-demand transmission services