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cookie using barcode integration for visual .net control to generate, create barcode 128a image in visual .net applications. Intelligent Mail Glossary 1077 order. When you return to the site, it knows who you are and can supply your name and address for subsequent orders. You may consider cookies to be an invasion of privacy.

CPU Central processing unit. The part of a computer that controls all the other parts. The CPU includes the control unit and the arithmetic and logic unit (ALU).

The control unit fetches instructions from memory and decodes them to produce signals that control the other parts of the computer. These signals can cause data to be transferred between memory and ALU or peripherals to perform input or output. A CPU that is housed on a single chip is called a microprocessor.

Also processor and central processor. An individual who attempts to gain unauthorized access to a computer system. These individuals are often malicious and have many means at their disposal for breaking into a system.

Contrast with hacker (page 1084).FOLDOC The system suddenly and unexpectedly stops or fails. Derived from the action of the hard disk heads on the surface of the disk when the air gap between the two collapses.

The practice and study of encryption and decryption encoding data so that only a specific individual or machine can decode it. A system for encrypting and decrypting data is a cryptosystem. Such systems usually rely on an algorithm for combining the original data (plaintext) with one or more keys numbers or strings of characters known only to the sender and/or recipient.

The resulting output is called ciphertext (page 1075). The security of a cryptosystem usually depends on the secrecy of keys rather than on the supposed secrecy of an algorithm. Because a strong cryptosystem has a large range of keys, it is not possible to try all of them.

Ciphertext appears random to standard statistical tests and resists known methods for breaking codes.FOLDOC .cshrc file CSS In your home directory, a file that the TC Shell executes each time you invoke a new TC Shell.

You can use this file to establish variables and aliases. Cascading stylesheet. Describes how documents are presented on screen and in print.

Attaching a stylesheet to a structured document can affect the way it looks without adding new HTML (or other) tags and without giving up device independence. Also stylesheet. The item that is immediately available, working, or being used.

The current process is the program you are running, the current line or character is the one the cursor is on, and the current directory is the working directory.. cracker crash cryptography current (process, line, character, directory, event, etc.) cursor A small ligh code 128a for .NET ted rectangle, underscore, or vertical bar that appears on a terminal screen and indicates where the next character will appear. Differs from the mouse pointer (page 1094).

. 1078 Glossary daemon A program th at is not invoked explicitly but lies dormant, waiting for some condition(s) to occur. The perpetrator of the condition need not be aware that a daemon is lurking (although often a program will commit an action only because it knows that it will implicitly invoke a daemon). From the mythological meaning, later rationalized as the acronym Disk And Execution MONitor.

FOLDOC A particular format for storing, organizing, working with, and retrieving data. Frequently, data structures are designed to work with specific algorithms that facilitate these tasks. Common data structures include trees, files, records, tables, arrays, etc.

A self-contained, independent entity of data carrying sufficient information to be routed from the source to the destination computer without reliance on earlier exchanges between this source and destination computer and the transporting network. UDP (page 1112) uses datagrams; IP (page 1088) uses packets (page 1098). Packets are indivisible at the network layer; datagrams are not.

FOLDOC See also frame (page 1083). A computer, usually a workstation, that uses a local disk to boot a copy of the operating system and access system files but does not use a local disk to store user files. A standard, simple database manager.

Implemented as gdbm (GNU database manager), it uses hashes to speed searching. The most common versions of the dbm database are dbm, ndbm, and gdbm. Distributed denial of service attack.

A DoS attack (page 1080) from many systems that do not belong to the perpetrator of the attack. To correct a program by removing its bugs (that is, errors). Something that is selected without being explicitly specified.

For example, when used without an argument, ls displays a list of the files in the working directory by default. A set of changes made to a file that has been encoded by the Source Code Control System (SCCS). See DoS attack on page 1080.

When speaking of symbolic links, follow the link rather than working with the reference to the link. For example, the L or dereference option causes ls to list the entry that a symbolic link points to rather than the symbolic link (the reference) itself. A collection of windows, toolbars, icons, and buttons, some or all of which appear on your display.

A desktop comprises one or more workspaces (page 1116). An icon- and menu-based user interface to system services that allows you to run applications and use the filesystem without using the system s command-line interface..

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