Definition: Reverse an editing or similar action within application software to a previous action through a simple key-stroke or choice of menu item: most actions have one level of undo i.e. just one action can be undone. * Multiple levels of undo are provided by some software. The costs of an undoing Applications store previous actions in memory, either in the RAM or the hard-disk, therefore the more levels of undo you ask for, the more memory is used or, -- in the case of image editing -- gobbled up. But remember: most actions within the operating system e.g. saves, deletes, replacing a file etc. cannot be directly undone.

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