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Many of OAK's commands alter the active worksheet, and no Undo option is offered for any of them. (Sadly, Microsoft doesn't expose the mechanisms that would be necessary to allow an arbitrary sequence of Excel and Add-in actions to be reversed systematically. If it did, Operis would implement Undo in OAK.)
OAK intentionally does not deliver nagging messages warning that it is making hard-to-reverse changes to what might be the only copy of your spreadsheet. Operis aims OAK at competent spreadsheet users, and leaves it to them to take appropriate precautions, including
| • | making spreadsheet documents read-only before starting to work on them, so that it is not possible unintentionally to overwrite them with versions that OAK has changed |
| • | including some kind of version number in the file names, and increasing it at intervals, so that there is a chronological audit trail of different versions of the model. |
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