l workspaces. An extensible set of bitmap, pointer and parametric drawing primitives can be directed to these workspaces. The protocol also supports advanced options (keyboard and pointing device signaling), and can be used in remote application piloting and screen sharing. T.126 also supports in-band facsimile exchanges. T.126 is deliberately extensible; it allows any new or extended capabilities that are not defined in the original specification to be added later. Information about these extended capabilities is passed in-band. T.127 The formal title of the T.127 Recommendation is Multipoint Binary File Transfer. T.127 defines multipoint binary file transfer within an interactive conference. It provides mechanisms that facilitate simultaneous file distribution (broadcast) and retrieval. It Video Communications: The Whole Picture also provides for private distribution of files to a selected subgroup. T.127 permits file distribution control by a chairperson. T.127 protocols are simple and versatile. They provide core functionality with the ability to extend that core to meet the demands of more sophisticated applications. T.SHARE The formal title of the T.SHARE Recommendation is Multipoint Computer Application Sharing Protocol. T.SHARE has not been adopted, but the work of its authors is worthy of reconsideration later. T.SHARE defines a cross-platform, multipoint computer application-sharing model. It allows a computer application hosted at one site to be viewed at all sites within a session. It includes provisions that arbitrate which site is currently in control of the session's pointing device and keyboard stream. The result of T.SHARE is that multiple sites can concurrently host one or more shared applications. T.SHARE has two modes of operation. One, the Legacy Mode was designed to be compatible with Microsoft's NetMeeting and PictureTel's Group Share products. This was included to achieve industry compatibility in a market dominated by some very large companies. The Legacy Mode coexists harmoniously with a