CodeView (cv.hlp) (Table of Contents; Topic list)
Edit Menu: Undo Command
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     Shortcut key: ALT+BACKSPACE
 
     Use the Undo command to retract your most recent edit. Undo
     restores the current line to its previous condition.
 
     NOTE: The Undo command works only while the cursor is still on the
           edited line. Once you move the cursor off that line, Undo no
           longer has any effect.
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