UNDO will back out all edit changes made to a file since the last key was pressed that is considered an "attention" key. An attention key is a key that is mapped to the (Enter) keyboard function or is mapped to a primary edit command. Each time an "attention" event occurs when a file change has been made, it defines an undo-able change to the file.

Additional UNDO commands may be issued, up to the maximum level of UNDO commands that have been allowed for by the SETUNDO command; a maximum of 25 UNDO levels can be set.

See the SETUNDO command for more information.  

Note: The effect of an UNDO can be reversed by the REDO command.

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