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Some Smalltalk implementations are expensive because they offer large graphics libraries and other productivity-promoting features for use by professional programmers. Fortunately, other Smalltalk implementations are available at no cost. Most of this book is based on Smalltalk Express(TM), because Smalltalk Express is free, yet offers all you need to learn the language and to enjoy its power.
Capabilities of a commercial Smalltalk, VisualWorks(TM), are explained in Chapter••missing reference••through Chapter••missing reference••.