Question1. When must I change my toner cartridge or process unit?
There is no specific time frame. You should change them when the print quality starts to deteriorate to an unacceptable level.
Question2. Where could I get a copy of Panasonic printer software driver?
You could download the driver from this website.
http:///www.panasonic.co.jp.8002/saga/english/printer.htm. Software driver for Window NT is not available.
Question3. Could my Panasonic printer,KX-P6 series used as a network printer?
No, You could not. Neither could you use it under a network environment.