Abstract: An information service system including a plurality of receiving stations and information service facilities. The information service facilities include a memory circuit which stores beforehand a distribution destination information set of receiving station identifiers allocated to the receiving stations, distribution destination information set being disposed in a predetermined order within the memory circuit, a memory circuit for storing a plurality of information to be supplied to receiving stations, an enciphering circuit for generating an enciphering key for optical receiving stations within a group which performs broadcast communications, and enciphering the service information with the enciphering key, and a circuit for transmitting the enciphered service information and service destination codes of service destination receiving stations encoded from the distribution destination information set, through broadcast communications.

Abstract: In a distributed processing system wherein a plurality of processors are connected by a transmission medium; a simulation method for a distributed processing system characterized by defining transmission delay times ascribable to the transmission medium, input/output data items and processing times of respective programs which are set in the system, and numbers of the processors in which the programs are stored.

Abstract: In a distributed system having a plurality of processors connected to a common transmission line, each processor comprises means for registering erroneous programs within the processor, and means for changing modes, so that a program is diagnosed on the basis of a processed result of data accepted from the transmission line and is registered in the erroneous program registration means if it is erroneous, and that the mode change means changes-over the test mode and the on-line mode by reference to the erroneous program registration means and in correspondence with the programs registered in or canceled from the registration means.

Abstract: A system for loading a program in a distributed system including a plurality of information processing units interconnected by a transmission system comprises an information processing unit for preparing a program and sending the program to the transmission system, another information processing unit having means for receiving the program from the transmission system and storing the program in a memory in accordance with a content of the program, and means for retrieving a program based on program structural information, which program corresponds to the program structural information, and sending the retrieved program to the transmission system, and other information processing units each having means for sending the program structural information to the transmission system and means for selecting a corresponding program from the transmission system and loading the selected program in the unit.

Abstract: In a system which includes of subsystems, and a transmission medium for coupling them, and in which a token is sent to the transmission medium, whereby the transmission medium is occupied; a transmission control method characterized, at least, in that each of the certain subsystems appends a code indicative of a function of certain data to the token and sends the resulting data to the medium, and that the subsystem receiving the data refers to the code indicative of the function of the data, thereby to independently judge whether or not the data is to be accepted into the own subsystem.

Abstract: In a distributed processing system where a series of processes are carried out by distributed processors connected through a network without provision of a control processor which controls the overall system, an arbitrary processor generates test information and the processors, each having a memory for storing a program to be tested, decide whether or not the program is to be test-run in accordance with the test information and, if test-run is carried out, send out the result of the test-run program into the network when necessary.

Abstract: In a processing system including a plurality of processing units connected to a common transmission line, the improvement for permitting program tests under on-line environments characterized in that each of the processing units decides whether or not a program loaded in its own processing unit is a program to be tested, establishes a test mode when the program is to be tested, processes the program irrespective of whether or not the program is in the test mode, data of a test result being generated on the basis of data of a processed result when the program is in the test mode, and delivers the results to the common transmission line.

Abstract: A file editing method and a system therefor is used in a file editing system for sequentially connecting the files, which are stored in memory devices of a plurality of distributed devices connected to a common signal transmission line, to an edition data flowing on the common signal transmission line. Each of the devices sends a structuring message having the combination and order of the files to be connected to the common signal transmission line; judges whether or not its own file is contained in files to be edited on the basis of the structuring message and its own connection information when it receives the structuring message; sends a response message having the information of the file to the common signal transmission line if its own file is contained; and structures a connection information required for the file edition in itself on the basis of the structuring message in case it is confirmed through the message that all the files to be edited exist in the system.

Abstract: In a method for checking consistency of distributed data in which data distributedly stored in a plurality of devices connected to a common data transmission line are sequentially combined, each device sends out to the data transmission line output data accompanied with information indicating a position of a processed result in the output data, and the device which receives redundant data compares collected redundant data to select a correct data by comparing only the portion of the data which was lastly added in accordance with the information accompanying the data.

Abstract: A system for loading a program in a distributed processing system including a plurality of information processing units interconnected by a transmission system. An information processing unit prepares a program and sends the program to the transmission system. Another information processing unit receives the program from the transmission system and stores the program in a memory in accordance with a content code of the program. A program based on program may be retrieved from the memory structural information, and sent to the transmission system. Each information processing unit includes a device for sending program structural information to the transmission system, selecting a corresponding program from the transmission system and loading the selected program in the unit.