How Undo and Redo works in ART?  
 
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What occurs to the Registry after executing *.REG files or after directly changing the Registry using Undo/Redo into Registry!?  
 
Undo modifies a Registry key, including its subkeys, for which a comparison was done. This key becomes identical to the key from the earlier snapshot of the Registry.  
 
Undo modifies the Registry in the following ways:
- It removes from the Registry all keys marked with a yellow bulb yelbulb as well as values in keys marked with a green bulb grnbulb on the Added tab.
- It adds to the Registry all the keys and values marked with either a yellow or green bulb yelbulbgrnbulb on the Deleted tab.
- It changes data "2" to data "1" in the values in the Distinction in Data tab in the Comparison results window.

Redo modifies the Registry in the following ways:  
- It adds to the Registry all the marked keys and their values that are listed in the Added tab.
- It removes from the Registry all the marked yelbulbgrnbulb keys and values on the Deleted tab.
- It changes data "1" to data "2" in the values listed in the Distinction in Data tab in the Comparison results window.