Patent ID: 7161699

Claim:
A printer system in which a host computer and printer apparatus are capable of communicating, the host computer comprising: (a) a generating unit adapted to generate a print job; (b) an assigning unit adapted to assign an identifier corresponding to a process demand for demanding a status of the printer apparatus, each process demand having a different identifier assigned thereto; and (c) a transmitting unit adapted to transmit a plurality of process demands and the identifiers respectively assigned to the plurality of process demands, from the host computer to the printer apparatus; the printer apparatus comprising: (a) a receiving unit adapted to receive the plurality of process demands and the identifiers assigned to the plurality of process demands; and (b) a responding unit adapted to send, from the printer apparatus to the host computer, a response to a process demand, which indicates the identifier related to the process demand, wherein said host computer discriminates correspondence between the process demand and the response based on the identifier assigned by said assigning unit and the indication of the identifier indicated by the response.