SOFTWIN Internet Security 2010 User's Guide download pdf (Page 352)

Filename extension

The portion of a filename, following the final point, which indicates the kind of

data stored in the file.

Many operating systems use filename extensions, e.g. Unix, VMS, and MS-DOS.

They are usually from one to three letters (some sad old OSes support no more

than three). Examples include "c" for C source code, "ps" for PostScript, "txt"

for arbitrary text.

Heuristic

A rule-based method of identifying new viruses. This method of scanning does

not rely on specific virus signatures. The advantage of the heuristic scan is that

it is not fooled by a new variant of an existing virus. However, it might

occasionally report suspicious code in normal programs, generating the so-called

"false positive".

Internet Protocol - A routable protocol in the TCP/IP protocol suite that is

responsible for IP addressing, routing, and the fragmentation and reassembly

of IP packets.

Java applet

A Java program which is designed to run only on a web page. To use an applet

on a web page, you would specify the name of the applet and the size (length

and width, in pixels) that the applet can utilize. When the web page is accessed,

the browser downloads the applet from a server and runs it on the user's

machine (the client). Applets differ from applications in that they are governed

by a strict security protocol.

For example, even though applets run on the client, they cannot read or write

data onto the client's machine. Additionally, applets are further restricted so

that they can only read and write data from the same domain that they are

served from.

Macro virus

A type of computer virus that is encoded as a macro embedded in a document.

Many applications, such as Microsoft Word and Excel, support powerful macro

languages.

These applications allow you to embed a macro in a document, and have the

macro execute each time the document is opened.

Mail client

An e-mail client is an application that enables you to send and receive e-mail.

Memory

Internal storage areas in the computer. The term memory identifies data storage

that comes in the form of chips, and the word storage is used for memory that

Glossary

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SOFTWIN Internet Security 2010 User's Guide Page 352