Abstract: A method of exchanging a business document between a customer computer and a supplier computer connected to a network, is provided, in which a business document is printed for the supplier; order data from the purchase order is extracted through a printer driver; the order data is transmitted to the supplier computer; the business document is presented on the supplier computer in a form pre-selected by said supplier; the business document is amended by making a change; the amended business document is printed; the amended order data is extracted by the printer driver from said amended business document; the change is determined by comparing the order data from the business document to the amended order data from the amended business document; the amended business document is transmitted to the customer computer, and presented such that said data prior to the change appears as crossed out.

Abstract: A method of exchanging a business document between a customer computer and a supplier computer connected to a network, is provided, in which a business document is printed for the supplier; order data from the purchase order is extracted through a printer driver; the order data is transmitted to the supplier computer; the business document is presented on the supplier computer in a form pre-selected by said supplier; the business document is amended by making a change; the amended business document is printed; the amended order data is extracted by the printer driver from said amended business document; the change is determined by comparing the order data from the business document to the amended order data from the amended business document; the amended business document is transmitted to the customer computer, and presented such that said data prior to the change appears as crossed out.