To provide a non-transitory storage medium and a client device, both having a printer driver (PD), that are capable of suppressing the performance degradation of the printer driver resulting from a time required for exchanging a setting information of the function of the printer driver between the print server (PS) and the client device (CD). In an embodiment, the non-transitory storage medium, that includes the PD for an MFP that is to be executed by the CD causing the MFP to print via the PS controlling the MFP, restricts the available functions among the functions of the PD to reduce the size of the Devmode to be transmitted to the PS, when the communication speed between the PS and the CD is smaller than or equal to a specified speed.

An image forming apparatus that causes a user's will concerning which of a communication speed and power saving efficiency is given priority to be reflected on determination of a power saving mode. In shifting the apparatus to a power saving mode, a first setting inhibits disconnection of a communication link and a second setting indicates changing communication speed to a lower speed. One of the first and second settings is made according to a user's instruction. In the first setting, the apparatus is shifted to a first power saving mode. In the second setting, the apparatus is shifted to a second power saving mode. When the apparatus is shifted to the first power saving mode, the communication link is not disconnected. When the apparatus is shifted to the second power saving mode, the communication speed of the apparatus is changed to the lower speed.

Provided is an image forming apparatus that allows a remote operation terminal to operate an image processing apparatus connected by SIP. On this account, the image forming apparatus (100) connected to the remote operation terminal (300) by SIP includes a remote operation-request message receiving part that receive a remote-operation request message from the remote operation terminal (300), a remote-operation response message transmitting part that transmits a remote-operation response message in response to the remote-operation request message, and an operation-screen information transmitting part that transmits operation screen information of the image forming apparatus (100) to the remote operation terminal (300) in accordance with the communication condition of the communication session when an SIP-based communication session is established between the remote operation terminal (300) and the image forming apparatus (100).

When an image forming apparatus satisfies a condition to shift it to a power saving state, if a specific function that needs to respond to an inquiry from an external apparatus within a predetermined time is set, a power control unit shifts the image forming apparatus to a first power saving state in which power is supplied to a control unit configured to respond to the inquiry, and if the specific function is not set, shifts the image forming apparatus to a second power saving state in which no power is supplied to the control unit.

A printing device includes a printing device side wireless communication unit configured to execute wireless communication with a mobile terminal, an operation acquisition unit configured to acquire user operation thereof, and a processor. The processor is configured to acquire operation data which is generated as the operation acquisition unit acquires a user operation, acquire establishment data which is generated as the printing device side wireless communication unit establishes a wireless communication with the mobile terminal, and issue a request control to control the printing device side wireless communication unit to transmit request data requesting the mobile terminal to transmit print data necessary for printing, via the wireless communication, when the establishment data is acquired, the request control being issued in accordance with the operation data as acquired.