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A set of instructions that can be executed by a computer, and are written for a specific purpose such as word processing or creating a spreadsheet. Also called software.


A disk, folder, or file containing data that can be read, but cannot be written to or deleted. Also referred to as locked or write-protected.

removable media

Disks that can be removed, as opposed to those that cannot. Some examples of removable media are floppy disks, disk cartridges (SyQuest and Bernoulli, for example), CDs, and Zip disks.


A list of instructions that can be executed without user interaction. Unlike other types of programs, scripts can be opened with text editors or word processing programs, so they are very easy to change. Examples of scripts include Visual Basic programs and network login scripts.

startup disk

A disk that contains the System files necessary to start your computer. Startup disk usually refers to a floppy disk or CD that can be used to start the computer in an emergency.

system extension

A program that loads into memory when a Macintosh computer is started. Also known as an INIT or startup document.

System file

The file stored in the System folder that the Macintosh computer uses to start up.

System folder

The folder on the startup disk that contains the files your Macintosh computer requires to run, such as the System file, Finder, system extensions, desk accessories, and control panels.

Trojan horse

A destructive program often designed to cause damage or do something malicious to a system, while disguised as something useful or interesting. Unlike viruses, Trojan horses don’t make copies of themselves. Some Trojan horse programs perform malicious actions on the computer on which they are run, while others, such as Back Orifice, provide remote-control capabilities for hackers.

unknown virus

A virus for which Norton AntiVirus does not contain a virus definition.



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