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A New Model
We make a distinction between the typical single-application, multi-document model of computing and the OLPC full-screen activity interface, where each object (document) runs within its own instance—multiple instances of a given activity may run in parallel. Activity instances within Sugar provide a way to handle files as objects; each instance may represent a different group of collaborating individuals. "Open" and "Save" actions are relegated to a journal interaction; creating a new instance of the Draw activity implicitly creates a new drawing. To "open" an older drawing, you simply resume it.
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