F-SECURE CLIENT SECURITY 8.00 Administrator's Manual page 318

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Trojan
A trojan is usually a standalone program that performs destructive or
other malicious actions. Destructive actions can vary from erasing or
modifying the contents of files on a hard drive to a complete
destruction of data.
A backdoor trojan is a remote access tool that can allow a hacker to
get full control over the entire infected system. They can send,
receive and run files and even listen and see what happens at the
computer if it is equipped with a microphone or a webcam.
Unicast traffic
Unicast traffic is traffic from one specific computer to another specific
computer.
URL
(Uniform Resource Locator) The standard way to give the address of
any resource on the Internet.
User mode
The protected part of an operating system where user applications
are run and that calls kernel mode to perform operating system
functions.
Virus
A computer program that spreads by replicating itself.
Virus Definitions
Virus Definitions are used to detect viruses. Whenever a new virus is
found, the databases need to be updated for virus protection to be
able to detect that virus.
VPN
Virtual Private Network. A secure private network that uses the
existing public Internet.
WAN
(Wide Area Network) Any internet or network that covers an area
larger than a single building or campus.