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Sassafras is a prototype User Interface management System (UIMS) specifically designed to support a wide range of user interface styles. In particular; it supports the implementation of user interfaces where the user is free to manipulate multiple input devices and perform several (possibly related) tasks concurrently. Sassafras is based on a new language for specifying the syntax of human computer dialogues known as Event-Response Language (ERL) and a new run-time structure and communication mechanism for UIMSs known as the local Event Broadcast Method (LEBM). The effectiveness of Sassafras is demonstraed b describing two interfaces that have been implemented with Sassafras. |