Q. What is the proposed solution for handling concurrent dialogs using STNs in direct manipulation interfaces?

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Q. What is the purpose of adding an "escape" key in a dialog system?

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Q. How is the concept of "escape" handled in hierarchical State Transition Networks (STNs)?

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Q. How is the behavior of a help system different from that of an escape mechanism in a dialog?

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Q. What is a fundamental difference between State Transition Networks (STNs) and Petri nets?

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Q. What do the circles represent in a Petri net?

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Q. How are transitions fired in a Petri net?

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Q. What does an inhibition arc represent in a Petri net?

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Q. How does a hierarchical structure in Harel's state charts differ from that of traditional State Transition Networks (STNs)?

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Q. In Harel's state charts, what does a dashed line between two subdialogs with the "AND" keyword indicate?

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Q. What does the "history" feature in Harel's state charts represent?

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Q. How does the OFF button act as an escape in Harel's state charts?

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Q. What is the advantage of using flow charts for dialog specification?

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Q. In flow charts, what do the rectangular boxes typically represent?

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Q. Which aspect of user interactions is associated with a parallelogram shape in flow charts?

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Q. What is the primary purpose of the elliptical 'finish' box in a flow chart?

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Q. In the described flow chart, what does the 'Y/N' question refer to?

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Q. What is the main difference between using a flow chart for dialog design and program design?

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Q. Which shape in a flow chart represents processes and decisions made by the system?

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Q. What does the 'history' feature represent in the context of a flow chart?

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