I think what he means is - User scans a barcode and LN detects that the barcode has been read and processed.
I don't see any inbuilt function to identify the barcode scan in LN. It can just generate the barcode for you but cannot detect whether it has been scanned or not. What you can do is, you can trigger a store procedure or something like that to update LN table when the barcode database table is updated. That will be an integration you can think of if you want this functionality.
Other that any such integration, I am not sure if you can do it just by using LN Tools.
Unless you try to do something beyond what you have already mastered, you will never grow!