Abstract: A scan and link system prompts salespersons or cashiers to recommend a certain product to a customer which is associated with, or complimentary to, a product that the customer wants to buy. The scan and link system and method improves customer attention and commercial profitability. Each time a product is scanned by a salesperson, scan and link software loaded on the cash register checks a database of associated or complimentary products and displays information on the cash register display via one or more advice pop-ups. The salesperson or cashier can suggest that the customer purchase the associated or complimentary products. The database of associated or complimentary products can be generated by the store owner, and/or by experts working in the specific industry of the user. Administration tools allow the user to change the position of the advice pop-up on the display, to hide it, or adjust its display frequency.