When option "Use barcode scanner" is enabled Invoice Window contains field to input code. You are now ready to scan your items with your barcode scanner to fill in your invoice. If the item exist in the inventory, Simple Invoice will add it in. If you scan the same item again, Simple Invoice will increase the quantity in the invoice rather than add the same item to a new row. If you know code you can also enter barcode manually.
Images for products are stored in externeal folder which is not taken to backup file. Thanks for it program peformance is still very good and it allows you to save space on disc. But when you want to move your backup to other computer you must also copy images folder.