Patent ID: 8549618

Claim:
A client computer connectable to a host computer by a network, comprising: a communication part to communicate with the host computer; a display part to display information to a user; a system part to perform operations depending on an application; and a controller to put the system part into a locking state if a locking signal is received from the host computer through the communication part, and to control the communication part to end the locking state if an unlocking signal is received from the host computer through the communication part, wherein the system part does not perform operations in response to user input while the system part is in the locking state, and the controller stops a supply of power to the system part if the locking signal is received, and wherein the controller controls the display part to display information indicating that the system part is in a locking state if the client computer receives user input from the user while the system part is in the locking state and while the supply of power to the system part is cut off.