AT&T Corp, which signed for a collaborative effort with the chipmaker in January, appeared to be two-timing Intel Corp when it announced its own H.320 WorldWorx video teleconferencing to the desktop service in June (CI No 2,439) – but all is sweetness and light again. The two are to work together to build standards based on WorldWorx and Intel’s ProShare system, which uses the company’s own Personal Conferencing Specification and Indeo video compression rather than H.320. The videoconferencing market is about $500m annually, but it is growing at about 30% in unit volume a year, according to Dataquest guesstimates. The WorldWorx network is being designed to translate between incompatible systems and the companies plan a demonstration of the technology in December; it is set for commercial availability in 1995. Users will need an Integrated Services Digital Network, ISDN, line. To make installation of ProShare Video System 200 easier, AT&T WorldWorx Service will simplify end-to-end communications at customers’ locations by co-ordinating the ordering and installation of local access connections.