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A fragment is the portion of a track between successive events. A track fragment which is drawn is not guaranteed to be visible until Sabrina requests a refresh of the display. Sabrina, by default, does not request a refresh until all tracks are processed. A refresh may be requested after N fragments are drawn with
Track Update N
Depending on the complexity of the problem and the speed of the computer,
Track Update 1
may give the illusion of motion.