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- åHow Does Help on Wheels Work?
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- Help on Wheels talks with its clients using an invisible form of
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- inter-application communication called “Apple events.” Client
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- applications contain a small piece of standard program code, called the
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- “help engine,” which handles the relationship. They register as they
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- start up, and deregister as they shut down. When you ask for help on a
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- certain topic, they tell the server to display their help file, scrolled to
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- that point. If the server is displaying another client’s help file, or isn’t
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- running at all, the engine does what’s necessary to bring up the help you
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- want to see.
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- If it can’t find a copy of Help on Wheels on any mounted volume, the engine
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- will offer to save and open a TeachText copy of the help file — the same
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- text you’d get if you asked Help on Wheels to save on disk.
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