1.   Gates called for enhancing network security systems to help people get the information they want, block the mail they do not want and prevent computer intrusion.

2.   Instead, it urged users to install software that would prevent hacker intrusions.

3.   Members of the Senate Commerce Committee were split over whether new federal laws are needed to prevent electronic intrusion of Internet consumers.

4.   Officials at the company said Monday that they were continually upgrading their systems to prevent unauthorized intrusions.

5.   Redman responded that administrators keep an eye on the system to prevent unwanted intrusions.

6.   A federal computer security agency Monday was to outline ways to prevent the intrusions, the Times said.

7.   A federal computer security agency was to outline ways to prevent the intrusions on Monday, the Times said.

8.   He said foreign embassies should take measures to prevent intrusions.

9.   The string and rope is used to encircle the protesters and prevent intrusions from potential agitators.