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creo6 config.pro option documentation for: GENERAL_UNDO_STACK_LIMIT            

general_undo_stack_limit

Limits the number of possible Undo/Redo operations stored in the stack (memory). If the limit is reached, the first operation that was added to the stack will be the first operation removed.
Default and Available Settings:
50* - Limit the undo/redo mechanism to 50 operations. You can type a maximum storage value for the undo/redo operation.