Method of printing and printing system

摘要

A printing system comprising a data processor, a printer, and an ID code transmitter for allotting an ID code to a data file for distinguishing the data file from others. An input device is mounted on the printer for providing the ID code to the printer before a printing process is executed. The printer executes the printing process in response to the ID code provided thereto and on the basis of the data file to which the ID code has been allotted. The invention is particularly adapted for preventing the user of the data processor from obtaining a printout on the basis of another user's data file by mistake.