A printing apparatus comprises a real-time command interpreter that functions even when the printing apparatus is off-line, and interprets control commands simultaneously with receiving data. The mobile telephone is capable of downloading desired music data from the data delivery server. The support brackets may be affixed to the lightweight seat member by sliding the lightweight seat member into interference engagement with the support brackets. A registrant registers with the master server to provide a registrant contact point to be on the do-not-contact list to be distributed by the master server. The stirred powder-type toner is spread in the reserve tank and is provided to a development unit.