The Tempest continues to rage, and Apollo Computer Inc has Tempest-shielded its Domain Series 3000 Personal Workstation, DN580 Turbo graphics workstation and DSP90 and DFS90 servers to be sure of winning US government contracts where users are worried that someone might try a bit of electronic eavesdropping to find out what is being entered into the machines: remembering that a chain is only as strong as its weakest link, Apollo also offers an electrically-inert fibre optic local area network to link the things.