One of 10 in a series on videotex, this promotional brochure discusses the enhancement of cable service systems that use videotex and teletext technologies. It explains the advantages of Canada's approach to videotex, which uses the standard called NAPLPS (North American Presentation Level Protocol Syntax), otherwise known in Canada as Telidon. NAPLPS-Telidon is a method of electronically coding graphic information that can be used when creating, storing, or transmitting any image in a digital format. Advantages listed include its flexibility and sophistication, forward and backward compatibility, low cost, current availability, and capacity to replace traditional character generators. An overview of ways to improve cable service covers graphic enhancements using page creation and cycling equipment or using a microcomputer and creating sets of format pages. Also discussed is teletext, which involves transmitting cycles of pages, but equipping subscribers with their own decoders to allow them to choose the pages they wish to see at any time. (LMM)