Botnet attackers commandeer personal computers as part of a large network of "zombie" computers that, on command, target companies for spam attacks to cripple IT capabilities.

CNN: Twitter message could be cyber criminal at work

He cites the 1991 visit of an American inspection team to the Pechora radar in the Arctic Circle, when inspectors learned that the radar was passing along target-tracking information to a central command.

CENTERFORSECURITYPOLICY: Putin��s Lie

Prueher's decision that no nuclear target planners would be assigned to the Pacific Command staff, a dramatic departure from previous practice.

CENTERFORSECURITYPOLICY: Center For Security Policy

Ido Nehushtan tells Renee Montagne that Israel is not under "a full suspension" of aerial bombing but it will target only "immediate threats, " including Hezbollah missile launchers and command-and-control headquarters.

NPR: General: Israel Must Defend Itself

Nato said it had hit a "known command-and-control building" in the area, adding it did not "target individuals".

BBC: Libya crisis: Expelled Libyan ambassador departs UK

The target messages, enciphered with a Lorenz S42 machine as used by the German high command, were transmitted by a team of radio enthusiasts in Paderborn, Germany.

BBC: Colossus in operation during wartime, PA