es that underlie T.120 applications. This structure ensures a consistent approach to the development of T.120-compliant applications. The Generic Application Template does not impose rules on the structure of application software but rather defines what that applications that software might be called on to support. T.122 The formal title of the T.122 Recommendation is Multipoint Communication Service for Audiographics Conferencing-Service Definition. The T.122 MCS is a generic connection- oriented service that collects point-to-point transport connections and combines them to form a Multipoint Domain. T.122 supports highly interactive multimedia conferencing applications. It supports Video Communications: The Whole Picture full-duplex multipoint conferencing among an arbitrary number of connected application entities over a variety of networks (as specified in T.123). T.122 assumes error-free transport connections with flow control. It uses these connections to provide broadcasts and to support multipoint addressing (one to all, one to sub- group, one-to-one). It also ensures selection of the shortest path to reach the receiver and uniform data sequencing. T.122 uses tokens to resolve resource contention or channel availability. T.122 also works in tandem with T.125, a multipoint communication service protocol. Together, the two form Multipoint Communication Services, the regulative portion of T.120 conferences. T.123 The formal title of the T.123 Recommendation is Protocol Stacks for Audiographic and Audiovisual Teleconference Applications. T.123 presents a uniform OSI Transport interface and services to the MCS layer above it. Essentially, it is comprised of numerous network-specific transport protocol stacks. Network categories are addressed in T.123 profiles and include ISDN B channels, POTS, packet-switched networks (IP), and others. Each profile may extend as high as layer seven in the OSI reference model, depending on the mode selected. User Application T.131-NSM T.RDC-Remote Proprietary Audio Video Contro