To take one example, an ObamaCare-mandated update to a major computer network called the System for Electronic Rate and Form Filing, which governs insurance approvals, has been delayed by months.

WSJ: Review & Outlook: Hope and Exchange

It may be useful to think of a computer network as being like a system of roads.

ECONOMIST: Companies and information

To my surprise Google returned several results, which I clicked, and was suddenly looking at an interface that allowed the attackers to fully control a network of compromised computer system.

FORBES: Shadows In The Cloud

The new systems include an online booking system, e-prescriptions and fast computer network links between NHS organisations as well as the electronic records system.

BBC: Electronic records is one part of the ?6.8bn IT upgrade

After confirming the breach, the Chamber shut down and destroyed parts of its computer network, proceeding to revamp its security system over a 36-hour period.

ENGADGET: Chinese hackers target U.S. Chamber of Commerce, sensitive data stolen

Instead they are created by the system's network when a specific amount of computer work, known as a "block" has been completed.

BBC: Rewards set to halve for digital money miners

Virtualisation provides a way of hiding a computer's resources its central processor, operating system, internal memory, network controller, and storage devices behind a software curtain.

ECONOMIST: Putting a stop to online infection

In January 2003 the Microsoft SQL Server worm, known as Slammer, infected a private computer network at David-Besse nuclear power plant in Oak Harbor, Ohio, disabling a safety monitoring system for nearly five hours, says the Nuclear Regulatory Commission.

FORBES: On The Cover/Top Stories