Abstract: A client computer that is connectable to a host computer by a network, includes a communication part to communicate with the host computer; a user input part; a system part to perform a function depending on an application; and a controller to control the system part to be put into a locking state to stop performing operations input by a user from the user input part if a locking signal is received from the host computer through the communication part, and to control the communication part to unlock the locking state if an unlocking signal is received from the host computer through the communication part.

Abstract: A client computer that is connectable to a host computer by a network, includes a communication part to communicate with the host computer; a user input part; a system part to perform a function depending on an application; and a controller to control the system part to be put into a locking state to stop performing operations input by a user from the user input part if a locking signal is received from the host computer through the communication part, and to control the communication part to unlock the locking state if an unlocking signal is received from the host computer through the communication part.

Abstract: A client computer that is connectable to a host computer by a network, includes a communication part to communicate with the host computer; a user input part; a system part to perform a function depending on an application; and a controller to control the system part to be put into a locking state to stop performing operations input by a user from the user input part if a locking signal is received from the host computer through the communication part, and to control the communication part to unlock the locking state if an unlocking signal is received from the host computer through the communication part.

Abstract: An electronic apparatus includes a non-volatile memory, a volatile memory to store an operation of the operating system, a user interface unit to receive an end command to terminate an operation of the operating system, and a control unit to change an operation mode of the operating system to a log off mode and to store operating system data of the log off mode stored in the volatile memory in the non-volatile memory and to cut off power supplied to the electronic apparatus, if the end command is input.

Abstract: A client computer that is connectable to a host computer by a network, includes a communication part to communicate with the host computer; a user input part; a system part to perform a function depending on an application; and a controller to control the system part to be put into a locking state to stop performing operations input by a user from the user input part if a locking signal is received from the host computer through the communication part, and to control the communication part to unlock the locking state if an unlocking signal is received from the host computer through the communication part.

Abstract: A method of maintaining security of a BIOS included in a BIOS ROM of a computer system. The method of BIOS security of the computer system includes storing a check sum value calculated by byte-adding a user password and a product serial number of a BIOS ROM. The method further includes comparing the stored check sum value with a check sum value calculated by byte-adding an inputted password and the product serial number of the BIOS ROM. The method further includes enabling writing to the BIOS ROM when the stored check sum value and the calculated check sum value are equal. Thus, by adding a checking function to check the product serial number given by manufacturer and the director password given by a user, the BIOS ROM is effectively protected from an optional or malicious falsification, change, or removal action.

Abstract: A client computer that is connectable to a host computer by a network, includes a communication part to communicate with the host computer; a user input part; a system part to perform a function depending on an application; and a controller to control the system part to be put into a locking state to stop performing operations input by a user from the user input part if a locking signal is received from the host computer through the communication part, and to control the communication part to unlock the locking state if an unlocking signal is received from the host computer through the communication part.

Abstract: A computer system that includes: an installing unit to which an external device is installed to support either a first interface or a second interface; an external device controller which includes a first controller to communicate with the external device when installed to the installing unit, via the first interface, and a second controller to communicate with the external device when installed to the installing unit, via the second interface; an external device determiner to determine an interface supported by the external device installed to the installing unit; and a controlling unit to control the external device controller to disable a controller communicating through the interface that is not supported by the external device installed to the installing unit, based on a determination result from the external device determiner during a POST operation. Thus, a computer system is provided to promote saving system resources and power consumption.

Abstract: A method of maintaining security of a BIOS included in a BIOS ROM of a computer system. The method of BIOS security of the computer system includes storing a check sum value calculated by byte-adding a user password and a product serial number of a BIOS ROM. The method further includes comparing the stored check sum value with a check sum value calculated by byte-adding an inputted password and the product serial number of the BIOS ROM. The method further includes enabling writing to the BIOS ROM when the stored check sum value and the calculated check sum value are equal. Thus, by adding a checking function to check the product serial number given by manufacturer and the director password given by a user, the BIOS ROM is effectively protected from an optional or malicious falsification, change, or removal action.