In Smalltalk, code libraries are loaded into the running system, and become part of the environment.
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VisualWorks is a cross-platform implementation of the Smalltalk language.
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The lineage of VisualWorks goes back to the first Smalltalk-80 implementation by Xerox PARC.
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So even basic classes, like Object, differ from those in other Smalltalk-80 IDEs like Squeak and Dolphin Smalltalk.
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Smalltalk is a pure object oriented programming language, which means the only way to get something to happen within Smalltalk is by sending messages to objects.
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These can be "filed in" to the VisualWorks IDE to generate any classes not already contained in the Smalltalk image.
ezboard was written in Smalltalk VisualWorks 3.1 by Vanchau Nguyen with Jay O'Connor.