Provided are an aluminum alloy having high toughness and high electric conductivity, an aluminum alloy wire, an aluminum alloy stranded wire, a covered electric wire, a wire harness, and a process for production of an aluminum alloy wire. At least one pocket and preferably two concentric pockets may be provided to aid with manipulating the prosthesis. The invention further relates to a further method for operation virtual networks, a data network system, a computer program and a computer program product adapted to perform the inventive methods. An implement and twisters for use in such a method are also described. The helical guide vane is formed on the separate vane portion f the apparatus and thus the apparatus is simple to construct, since the helical guide vane is formed prior to insertion into duct. If the at least one participant server does not have the requested information, the requested information is downloaded from the main server to the at least one participant server.