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technological improvement has made metaphors depict these real-world experiences more realistically to ultimately enhance interface performance. Beginning users, however, could use a sort of help box, because the metaphor is not always going to be clear enough for them to understand, no matter how much effort its programmers devote to making it resemble something the users understand. Experts, on the other hand, understand what is going on with the technical aspects of an interface metaphor. They know what they want to do and they know how to

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