Abstract: A method for detecting reachability of client computers communicatively coupled in a computer network to a server computer. A plurality of identifier tags are resident in the memory of the server. The server generates a data packet comprising an I.C.M.P. echo packet and selects a first identifier tag from among the plurality of identifier tags resident in memory, the first identifier tag being chosen to correspond to a first client computer. The server inserts the first identifier tag into the proper data segment of the echo packet and forwards the packet to the first client. After a predetermined time awaiting a responsive ping from the client, the server determines if the client is tag-compliant or non tag-compliant.

Abstract: The method provides for a way to ensure that the application program running on the host computer handles data received from the at least one mobile computer terminals when one of the mobile computer terminals goes out of range of the wireless network. Communication and association may be established between a mobile computer terminal and an access point on a local network. Then, when it has been determined that communications between the mobile computer terminal and the access point have been impeded, the mobile computer terminal may switch to batch mode to continue data collection.

Abstract: An apparatus management unit requests another apparatus management unit connected to the LAN to perform vicarious checking of the presence or absence of a packet addressed to itself. The requested apparatus management unit checks the presence or absence of a packet addressed to the requester apparatus management unit, and when there is a packet, notifies the requester apparatus management unit of the presence of the, packet via the LAN. Consequently, even in the sleep mode, the presence or absence of a mail addressed to an apparatus management unit can be checked and the mail can be taken in without any delay because the presence or absence of a packet addressed to the apparatus management unit is checked by another apparatus management unit.

Abstract: A message broker data processing apparatus has a unit for receiving published messages on a topic from a publisher application; a unit for processing the received messages; and a unit for distributing the processed messages to subscriber applications; wherein the unit for distributing includes a plurality of subscription point data processing nodes, a first subscription point data processing node distributes messages to a subscriber application which has previously registered a subscription request identifying the first subscription point data processing node with the broker apparatus.

Abstract: A remote proxy generator (300) generates a remote proxy class for use in client-side communications for communications between a client application (108) and a server object (110). A client-side type generator (302) generates a type object (174) that represents a class of the server object (110) and provides access to methods (190) of the server object (110). A client-side function generator (304) generates one or more function objects (172) corresponding in number to one or more methods (190) of server object (110). A client-side reference generator (306) generates a reference object (158) for managing encoding of messages sent between a remote proxy object (154) and the server object (110) into a format of a communications protocol used by a server-side object request broker (114). A client-side streamer generator (308) generates a set of streamer objects (180) corresponding in number to the one or more methods (190) of the server object (110).

Abstract: A network comprises an IEEE 1394 sub-network serving as a wire-communication system at the high-level layer, and a plurality of radio-communication terminals (radio-communication nodes) which form DHCP clients. The IEEE 1394 sub-network constitutes an in-home LAN (Local Network Area). The IEEE 1394 sub-network includes antenna base stations each serving as a DHCP server. The antenna base stations have a pool comprising a predetermined number of addresses which are assigned automatically to radio-communication terminals (or DHCP clients) in a cell under control by each of the antenna base stations. In this case, the addresses in the pool controlled by the antenna base stations (DHCP servers) are varied among the servers according to a dynamic mobility distribution of radio-communication terminals. In this way, addresses can be utilized efficiently and, at the same time, it is possible to avoid a bus reset caused by a movement of a radio-communication terminal.

Abstract: A network management apparatus is described which includes a port for connecting to a network for receiving management data from network devices on the network. The network management apparatus includes a processor for processing the received management data and for determining substantially a complete topology of the network and providing image data representative of the network topology. The apparatus further includes a display for receiving the image data and displaying a graphical representation of the network. The processor is adapted to process the received management data to obtain object data for each network object (i.e. device or link) on the network. The object data is provided to the display, for display in graphical form by means of an object tip or tool tip, when the user points to a predetermined part of the graphical representation of the corresponding network object on the display.