Abstract: Information processing system including pluralities of first and second equipment items, and a third equipment item. Each first equipment item stores history data and returns a first response block about controls and changes in status of each first equipment item, responsive to a data request from the second equipment items. Each second equipment item stores the history data returned responsive to the data request; a second response block returns history data stored in the second history storage block responsive to a request from the third equipment item; first and second lists store first information identifying latest history data returned from the first equipment items regarding each first equipment item, and second information identifies history data last returned to the third equipment item regarding each first equipment item. Third equipment item's third history storage block stores history data returned responsive to the data request made to the second equipment items.

Abstract: Information processing system including: a plurality of process control units storing process data including present value and time-series data or historical data, and a plurality of data collection units collecting and processing data from the process control units. The data collection units each include: a first dynamic management section managing access and exit of the data collection unit of interest to and from the information processing system and managing operating status of all data collection units currently accessing the information processing system; a second dynamic management section managing addition and removal of process control units to and from the information processing system; and a charge determination section determining process control units to be taken charge of by the data collection unit of interest based on first identification information allocated to each of the data collection units and on second identification information allocated to each of the process control units.

Abstract: Information processing system including: a plurality of process control units storing process data including present value and time-series data or historical data, and a plurality of data collection units collecting and processing data from the process control units. The data collection units each include: a first dynamic management section managing access and exit of the data collection unit of interest to and from the information processing system and managing operating status of all data collection units currently accessing the information processing system; a second dynamic management section managing addition and removal of process control units to and from the information processing system; and a charge determination section determining process control units to be taken charge of by the data collection unit of interest based on first identification information allocated to each of the data collection units and on second identification information allocated to each of the process control units.

Abstract: Information processing system including pluralities of first and second equipment items, and a third equipment item. Each first equipment item stores history data and returns a first response block about controls and changes in status of each first equipment item, responsive to a data request from the second equipment items. Each second equipment item stores the history data returned responsive to the data request; a second response block returns history data stored in the second history storage block responsive to a request from the third equipment item; first and second lists store first information identifying latest history data returned from the first equipment items regarding each first equipment item, and second information identifies history data last returned to the third equipment item regarding each first equipment item. Third equipment item's third history storage block stores history data returned responsive to the data request made to the second equipment items.

Abstract: A service authentication system includes a room entrance/exit manager that manages locations of users, a login manager or remote login manager that manages PC login, an authenticator that performs user authentication, a substitute authenticator that performs various authentications in an integrated manner, and a service management server that stores user authentication information. When the user has requested authentication from the authenticator, the authenticator requests authentication from the substitute authenticator, which then obtains room entrance/exit information from the entrance/exit manager and authentication information from the service management server and authenticates them based on the obtained information.

Abstract: In network systems which consist of global network and local network, network device 1 is connected to the global network, and network device 3 is connected to the local network, and network device 2 is connected to both networks. When a network device 1 requests a network device 3 to update a program, a network device 2 which controls the network device 3 temporarily stores the update request and then issues the update request to the network device 3. Upon receiving the update request, the network device 3 shuts down itself and updates the program if the tasks currently running on the network device itself is not important ones. The network device 3, when turned on, also acquires the update request that has been temporarily stored by the network device 2.

Abstract: In a system for easily realizing security in a homenetwork by preventing communication from being made with a terminal illegally connected to the homenetwork, an information appliance and a key management server are connected to a homenetwork via network connector. By inserting an authentication tag into the information appliance, authentication with the key management server is performed and a public encryption key for allowing communication to be made with another information appliance connected to the homenetwork is obtained, thereby enabling safe communication to be made in the homenetwork.