qcenv.hlp (Topic list)
Important Notice
The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
Undo Command
Shortcut key: ALT+BACKSPACE
 
The Undo command retracts your most recent edit. It
restores the current line to its previous condition.
 
 ► 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   line, Undo no longer has effect.