The UNDO command allows you to cancel previously executed commands. This is especially useful if you have deleted things by accident. Multiple UNDO commands cancel the corresponding number of commands until the last EDIT, OPEN, AUTO, or REMOVE command is reached. It is not possible to "undo" window operations.
The UNDO command uses up disk space. If you are short of this you can switch off this function with the SET command
SET UNDO_LOG OFF;After executing the UNDO command, objects on the screen may appear to be partly destroyed. Refresh the screen (function key F2) in such a case.
UNDO/REDO is completely integrated within Forward&Back Annotation.
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