Abstract
The basic ideas for the design and the implementation of a direct (graphical) manipulation interface system are described. Architecture and structure are based on layered models. The system allows the inclusion of deictic / natural language references to objects represented on the screen. The system was developed and implemented on Sun workstations in ‘C’ and ‘Prolog’ under the operating system Unix, providing a set of modules and a communication layer for combined interfaces. Two applications, a direct manipulative interface to an expert system and a form query system allowing natural language/direct manipulation interaction, are described.
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