A method for displaying information includes identifying computer-readable service code at a service site, which code, when read by a client computer via a network, causes the computer to display at least one service page containing service information. The components exchange data as if they were communicating over an actual communications network using networking protocols. A position-coding pattern in the form of a plurality of symbols may be reproduced in the writing area, an arbitrary position area of a predetermined size of the position-coding pattern unambiguously defining a position on the product. Process maps may be associated with clientscustomers, applications andor issue categories. The portable heater preferably produces heat at different outputs and the current used to power the resistance heating arrangement is used to power the fan motor.