Abstract: A method and system for printing documents on a network printer, are provided. The method includes defining a print job at a user's source station for printing in the printer. The print job includes print data and print process parameters. The print process parameters include a specification of a print media for printing images according to the print data, each media having print media properties. The defining step includes a generic print media specifying process, in which a print media for printing images according to the print data is selected by the user within constraints of a general set of media available for any user of the printer. The defining step also includes an alternative, specific, print media specifying process, in which a job-proprietary print media not included in the general set is specified by entering a free-form definition character string, as an identifying property of the job-proprietary media.