Where parameter values have been copied from one file to another, the Undo button becomes active providing you with an option to undo the change.
Undoing the change will return the file to the state before the copy was executed. The undo buffer is limited only by the available memory so all changes made in the file can be undone in the same sequence as they occurred. Once the Undo button has been used the Redo button becomes active.
Redoing the change will return the file to the state before the last change which was undone. The redo buffer is limited only by the available memory, so all undo actions can be redone in the same sequence as they occurred.
Note: As soon as a fresh copy between the files is executed the Redo buffer is reset and all previous undo actions can no longer be redone with the Redo button.