Abstract: The invention allows automatically multi-booting a computer. Each functional mode of a computer having at least two operating systems installed is associated with one of the operating systems. Functional mode information identifying a particular functional mode of the computer is stored by a recovery system. While starting the computer, a boot loader receives the stored functional mode information, selects the operating system associated with the particular functional mode, and activates the selected operating system for the computer.

Abstract: The present invention discloses a method, system and mirror driver for detecting duplicated frames in a mirrored data communication network system comprising at least one sender, at least one receiver and at least two data communication networks between the sender and receiver. Each receiver creates and maintains at least one data structure comprising one or more entries, an entry comprising key information for each one of the received data frames. When a data frame is received via a data network, an index to the data structure is computed based on information acquired from the received data frame. If the entry corresponding to the computed index is empty or the entry does not comprise key information matching the key information in the received data frame, key information of the received data frame is stored on the entry and the data frame is forwarded onwards.

Abstract: The invention allows automatically multi-booting a computer. Each functional mode of a computer having at least two operating systems installed is associated with one of the operating systems. Functional mode information identifying a particular functional mode of the computer is stored by a recovery system. While starting the computer, a boot loader receives the stored functional mode information, selects the operating system associated with the particular functional mode, and activates the selected operating system for the computer.

Abstract: The present invention concerns a system for transmitting internal messages in a synchronizing local network. The system comprises multiple computer units for running application processes. The system further comprises multiple interface units, each for transmitting an internal message from a sending computer unit to several receiving computer units. According to the invention, the system further comprises multiple external links, each for linking a computer unit to an interface unit. The system further comprises an interconnecting device for receiving messages from sending computer units and forwarding them to receiving computer units one sent message at a time.

Abstract: The present invention discloses a method, system and mirror driver for detecting duplicated frames in a mirrored data communication network system comprising at least one sender, at least one receiver and at least two data communication networks between the sender and receiver. Each receiver creates and maintains at least one data structure comprising one or more entries, an entry comprising key information for each one of the received data frames. When a data frame is received via a data network, an index to the data structure is computed based on information acquired from the received data frame. If the entry corresponding to the computed index is empty or the entry does not comprise key information matching the key information in the received data frame, key information of the received data frame is stored on the entry and the data frame is forwarded onwards.

Abstract: The present invention concerns a method and a system for accelerating fault recovery in a redundant, tree structured local area network. The invention is used to define some of the LAN ports, which are, for example, used to connect the switch (SW) into the IP router, as critical ones. Likewise, some other LAN ports, used to connect the IP hosts to said switch (SW), are defined as dependent of the critical links. If a critical LAN port or corresponding link is found to be non-functional, e.g. no carrier sensed, all LAN ports or corresponding links depending on it are declared as non-functional. The declaration is done at link level in a way which allows the device(s) or ports connected to the other end of the link to notice that the link is not in use anymore to carry traffic.

Abstract: The present invention concerns a system for transmitting internal messages in a synchronizing local network. The system comprises multiple computer units for running application processes. The system further comprises multiple interface units, each for transmitting an internal message from a sending computer unit to several receiving computer units. According to the invention, the system further comprises multiple external links, each for linking a computer unit to an interface unit. The system further comprises an interconnecting device for receiving messages from sending computer units and forwarding them to receiving computer units one sent message at a time.