When this item is selected (displays a check mark in the menu), Finale automatically keeps track of the accidentals on a given line or space in the measure, according to the standard rules of accidental notation. For example, if the first E in a measure has a flat, the next E flat in the measure doesn't normally display an accidental too. On the other hand, if the first E in a measure displays a flat, the next E that isn't flatted should display a natural.
If this item isn't selected, Finale doesn't keep track of the status of the accidentals on any particular line or space. If you add a new note or change a note's pitch, Finale doesn't update the configuration of accidentals on other notes.
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