| 摘要 |
A system and method for navigating or editing may include storing multiple forward or redo stacks and a single back or undo stack. The forward or undo stacks may include separate stacks for each page from which navigation occurs to a page of lower hierarchical level or for each operation for which another operation is subsequently performed. Positions of references in the forward or redo stacks may be modified in response to navigations or edits to place a last navigated page or operation at the top of the stack. The timing of such movement of references may be optimized.
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