Tomorrow's TV may make you a viewer-doer

Developers of interactive products and services are ecstatic over the planned acquisition of Tele-Communications Inc by Bell Atlantic Corp; they believe the mega-deal with legitimate their efforts and hasten the advent of a mass market for interactive television. Much work is being done by tiny companies in San Francisco such as Brilliant Media, MusicNet Inc and PF.Magic. MusicNet subscribers can use their telephones to preview and order records. A forthcoming Apple Macintosh-compatible compact disk from Brilliant Music will allow listeners to chose which instruments they want to hear on a music video. PF.Magic makes 'Third Degree,' an interactive game show. Other novel interactive services and products are discussed.