Abstract: A system of employing a single bar code provided on a shipping label for coordinating shipping and receiving information between supplier and customer includes accessing a supplier digital processor including a parts database from a customer digital processor via a digital communication link. Purchase order information is selected in the parts database. Authorization is provided from the customer digital processor to the supplier digital processor for the immediate shipment of the selected purchase order by means of an authorization command, and a single bar code is generated and provided on a shipping label in response to the authorization command, whereby the single bar code is linked to a plurality of predetermined relevant purchase and shipping information associated with the purchase order.