Symantec NORTON INTERNET SECURITY 2004, User Manual

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Glossary 217
port number A number used to identify a particular Internet
service. Internet packets include the port number to
help recipient computers decide which program
should handle the data.
PPP (Point-to-Point
Protocol) A protocol for communication between two
computers using a dial-up connection. PPP provides
error-checking features.
protocol A set of rules governing the communication and
transfer of data between computers. Examples of
protocols include HTTP and FTP.
proxy A computer or program that redirects incoming and
outgoing traffic between computers or networks.
Proxies are often used to protect computers and
networks from outside threats.
registry
A category of data stored in the Windows registry that
describes user preferences, hardware settings, and
other configuration information. Registry data is
accessed using registry keys.
removable media
Disks that can be removed, as opposed to those that
cannot. Some examples of removable media are
floppy disks, CDs, DVDs, and Zip disks.
router A device that forwards information between
computers and networks. Routers are used to manage
the paths that data takes over a network. Many cable
and DSL modems include routers.
script A program, written in a scripting language such as
VBScript or JavaScript, that consists of a set of
instructions that can run without user interaction.
service General term for the process of offering information
access to other computers. Common services include
Web service and FTP service. Computers offering
services are called servers.