improved security
Each security card has a barcode(number not shown) for its password, so even the sales person will not know what their password is. This can then be used on any workstation with a standard barcode scanner.
Take it another step and supervisor security cards can have photos and/or names on them.
ease of use
These cards can be used on any workstation with a standard barcode scanner. Great for Retail sales staff or part time / holiday workers.