Cunha, J.D.C. E. Vandoni2015-09-292015-09-2919801017-4656https://doi.org/10.2312/eg.19801001This paper presents the description of an interactive graphics system built on top of a GKS level 4 implementation. The system architecture is based on the notion of Process and the mainemphasis has been devoted to design a powerful "core", conceived as an extension of the operating system, around which different application programs can be developped with a minimum of effort.10.2312/eg.19801001