| In ART Undo is used to:
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| - Roll the Registry back to a previous state.
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| - Uninstall programs and/or hardware.
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| Undo is helpful to use as an uninstaller when an installed program does not uninstall itself or when its uninstaller is faulty, i.e. incompletely removes its keys and values from the Registry.
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| Redo is used to:
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| - Roll the Registry back to its previous state after using Undo.
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| - Install programs and/or hardware.
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| Redo is very useful as an installer for System Administrators to install the same program on several PCs.
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| To use Undo or Redo for specific keys, first compare those keys (excluding whatever subkeys you don't need). There are two Undo/Redo methods in ART.
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The first method is to create *.REG files and execute them later without having to use ART, e.g. with Windows Explorer. You can apply this method by pressing the button  Save to Undo files or  Save to Redo files in the Compare window.
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| Undo and redo files can be used for:
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| - Viewing registry changes in plain text format (unlike the trees presented in ART).
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| - Storing registry changes compactly independent from ART.
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| - Editing a *.REG file prior to executing it.
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| Executing *.REG files doesn't always produce the intended results due to some bugs or limitations in the programs that process these files. For example, lines that are too long may be truncated. Or, if a key has the Value Name of "Default", and its Value Data is not set, it is impossible to restore the key without deleting it. That is why the Undo and Redo functions that directly change the Registry were introduced and that brings us to the second method.
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The second method to Undo/Redo in ART is used within the Compare window, which has the buttons  Undo into Registry! and  Redo into Registry! Neither of these buttons use *.REG files. They make changes directly into the Registry, thereby reducing the possibility of incomplete or corrupted changes.
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| How Undo and Redo works in ART?
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| Creating Undo / Redo Files
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| Undo / Redo functions
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