This paper presents an overview of the Cedar programming environment, focusing on its overall structure-that is, the major components of Cedar and the way they are organized. Cedar supports the development of programs written in a single programming language, also called Cedar. Its primary purpose is to increase the productivity of programmers whose activities include experimental programming and the development of prototype software systems for a high-performance personal computer. The paper emphasizes the extent to which the Cedar language, with run-time support, has influenced the organization, flexibility, usefulness, and stability of the Cedar environment. It highlights the novel system features of Cedar, including automatic storage management of dynamically allocated typed values, a run-time type system that provides run-time access to Cedar data type definitions and allows interpretive manipulation of typed values, and a powerful deuice-independent imaging model that supports the user interface facilities. Using these discussions to set the context, the paper addresses the language and system features and the methodologies used to facilitate the integration of Cedar applications. A comparison of Cedar with other programming environments further identifies areas where Cedar excels and areas where work remains to be done.

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This paper presents an overview of the Cedar programming environment, focusing primarily on its overall structure: the major components of Cedar and the way they are organized. Cedar supports the development of programs written in a single programming language, also called Cedar. We will emphasize the extent to which the Cedar language, with runtime support, has influenced the organization, comprehensibility, and stability of Cedar. Produced in the Computer Science Laboratory (CSL) at the Xerox Palo Alto Research Center, Cedar is a research environment supporting the development and use of experimental programs, emphasizing office information and personal information management applications. Although it was clear that some unsolved problems would be addressed, the intent was to combine well-understood methods and technologies to exploit a new generation of high-performance personal computers, including the Xerox 1132 (Dorado) and Xerox 1108 (Dandelion).

The EtherphonerM system has been developed to explore methods for extending existing multi-media office environments with the facilities needed to handle the transmission, storage, and manipulation of voice. Based on a hardware architecture that uses microprocessor-controlled telephones to transmit voice over an Ethernet that also supports a voice file server and a voice synthesis server, this system has been used for applications such as directory-based call placement, call logging, call filtering, and automatic call forwarding. Voice mail, voice annotation of multi-media documents. voice editing using standard text editing techniques, and applications of synthetic voice use the Etherphones for voice transmission. Recent work has focused on the creation of a comprehensive voice system architecture, both to specify programming interfaces for custom uses of voice, and to specify the roles of different system components, so that equipment from multiple vendors could be integrated to provide sophisticated voice services.

New features added to SAIL, an ALGOL based language for the POP-10. art discussed, The features Includej procedure variables: orocesses; coroutines» a limited form of backtracking! mechanism ' '-"-. new way KEYwUKDS mu11 in I e an event im for Inter-Drocess communication; and matching oroceduras, a of searching thf. LEAP associative data base. eveiU Cia LI^?il^e nc^L !^9 ua ; es^ ALG0L ' SAIL ' LE:AP ' multirtaskina, events, associative data structures, backtracking, coroutines, DrogresslvedeepenlnQ, The views and conclusions contained In this document are those of ...