However, the Program had installed mental firewalls in the minds of their operatives and Cable's effort caused the two to become brain dead.

Firewalls For higher levels of security, some organizations install "firewalls," typically a highly secure computer that acts as a buffer between the Internet and all the other computers within a company.

Individual users can also install firewalls from a variety of companies.

Install firewalls and virus-detection software on your home computer.

This should include physical security measures such as security cables, locks and cages and measures to secure your data - eg by backing the data up in a second location and installing anti-virus software, firewalls and intrusion detection software.

"Simply installing firewalls and intrusion detection systems and keeping antivirus signatures up to date won't cut it anymore since most companies never know they've been hit until someone outside the firm tells them."

People who run antivirus software on their home computers, who have installed firewalls to guard against incursions, and who take other security precautions need not worry so much about the proliferation of online threats, security experts say.

They also suggest using a virtual private network, which allows encrypted data to be sent from one location to another, and installing firewalls that keep outsiders from getting to your data and spyware filtering programs.

Also unexplained was how infected machines would meet General Services Administration security standards and get past the State Department's two computer security groups, which oversee the administration of their own test suites and install firewalls and other security software.

The country has installed firewalls to prevent international calls being made using VoIP.