Are you sure? IMO, this function is only useful if you use it only during short navigation sessions, for example when you go to one point of the DVD to another one, to analyze the PGCs that were played, and see, for example, if you can skip them. IMO it doesn't make sense to mark all PGCs as played every time.
Also, the yellow highlights are also there for this purpose. (But they are reset when you reset or quit the trace.)
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