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There are 165 names in this directory beginning with the letter U.
U.S. Robotics, Inc.

(USR). A modem manufacturer in Skokie, Illinois.

U/L

Upload. To send a data transmission.

U2F

Undetectable and Untraceable Fraud. A major issue for information technology is fraud made possible by technology and electronic transactions, especially crimes that leave no trace and no audit trail.

u3b

Top-level newsgroup category for an AT&T 3B computer newsgroup.

UA

User Agent. An OSI application process that can represent a human user or an organization to the X.400 Message Handling System. The user agent creates, sends, and receives messages for the user.

UART

Universal Asynchronous Receiver Transmitter. An integrated circuit which is used for transmitting and receiving data asynchronously via the serial port on the computer. It contains a parallel-to-serial converter for data transmitted from the computer and a serial-to-parallel converter for data coming in via the serial line. The UART also has a buffer for temporarily storing data from high-speed transmissions. See universal receiver transmitter.

UBE

Unsolicited Bulk Email. Unsolicited bulk email , or spam, is an attempt by a company to get others to pay for its advertising. The costs of this kind of email are paid not by the company but by the Internet service provider and ultimately by the end user. Spam is seldom used by reputable companies. Most bulk email consists of chain letters, pyramid schemes, MMF (“make money fast”) schemes, advertisements for pornographic sites, offers of software for collecting email addresses and sending unsolicited commercial email, stock offers for unknown startup companies, etc.

UBR

(Unspecified Bit Rate). Asynchronous transfer mode (ATM) service in which available bandwidth is not guaranteed.

UCS

Universal Character Set. A character set using 16-bit character codes, also called ISO 10646. UCS is a standard defined by the International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC), and allows 65,536 (or 256 x 256) characters instead of the 256 available in ASCII. If a printer has the UCS feature, it can use a larger range of characters. The 8-bit character sets ASCII and ISO Latin 1 are subsets within UCS.

udb

Universal Debugger. An interactive source level debugger from Kendall Square Research (KSR), used for testing and debugging serial and parallel programs written in KSR, Fortran, and some other languages.

UDDI

UDDI (Universal Description, Discovery, and Integration) is an XML-based registry for businesses worldwide to list themselves on the Internet. Its ultimate goal is to streamline online transactions by enabling companies to find one another on the Web and make their systems interoperable for e-commerce. While the group does not refer to itself as a standards body, it does offer a framework for Web services integration. UDDI is often compared to a telephone book's white, yellow, and green pages. The project allows businesses to list themselves by name, product, location, or the Web services they offer.

UDF

Universal Disk Format. The volume format of DVD disks.

UDMA

Ultra DMA (Ultra Direct Memory Access). A protocol developed by Quantum Corporation and Intel for disk drives that enables the computer to take advantage of the fast Ultra ATA disk drives. UDMA/33 is twice as fast as the previous disk drive standard for PCs, supporting burst mode data transfer rates of 33.3 MBps. A further improvement is UDMA/66. See DMA.

UDP

User Datagram Protocol. A communications protocol for the Internet network layer, transport layer, and session layer, which makes it possible to send a datagram message from one computer to an application running in another computer. Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol). Unlike TCP, UDP is connectionless and does not guarantee reliable communication; the application itself must process any errors and check for reliable delivery.

uemacs

MicroEmacs. A simple text editor which has versions for most personal computers and for many other computers. It is abbreviated this way because “u” looks like the Greek letter micro.

UHF

Ultra High Frequency. Electromagnetic frequencies in the range of 300 to 3000 megaherz. Used for some television and radio transmission.

UI

1. Unix International. An association that promoted an open computing environment based on UNIX System V. It disbanded in 1993 when Novell bought UNIX. 2. user interface. The combination of hardware and software that makes it possible for a user to interact with a computer or other device.

UIMX

User Interface Management System for X Windows. Interface design software from Visual Edge Software, Ltd., for Motif and Open Look.

UK Education and Research Networking Ass

(UKERNA). The organization that runs the UK educational and research network Super-JANET.

UKERNA

UK Education and Research Networking Association. The organization that runs the UK educational and research network Super-JANET.

UKUUG

United Kingdom Unix Users Group.

ULSI

Ultra Large Scale Integration. The use of integrated circuits with more than a million logic gates.

ultra high frequency

(UHF). Electromagnetic frequencies in the range of 300 to 3000 megaherz. Used for some television and radio transmission.

ultra large scale integration

(ULSI). The use of integrated circuits with more than a million logic gates.

Ultra SCSI-3

A very fast version of SCSI (Small Computer Systems Interface) which can have an 8-bit or 16-bit bus. The 8-bit version has a 50-pin adapter, transfers data at a rate of 20 megabytes per second, and can connect a maximum of 8 devices. The 16-bit version has a 68-pin adapter, transfers data at 20 to 40 megabytes per second, and can connect up to 16 devices.

Ultra-SCSI

An extension of SCSI-2 to double the transfer speed of Fast SCSI, to 20MB/second on an 8-bit connection and 40MB/second on a 16-bit connection.

Ultra64

A machine for playing Nintendo.

ultrafiche

Microfiche with images reduced 90 times or more.

ultraviolet

(UV). An invisible band of radiation having a wavelength less than 400 nanometers; beyond the visible spectrum at the violet end. Ultraviolet radiation has a wavelength shorter than visible light and longer than X-rays.

Ultrix

DEC's implementation of UNIX for the PDP-11, VAX, and DECstations.

UMA

Upper Memory Area. In a PC, the memory area between 640K and 1024K. Under DOS, this memory area is ordinarily designated for use by the ROM BIOS and display, and is unavailable for use by other programs. However, some of the free memory in this area can be used for device drivers or TSRs by implementing the commands DEVICEHIGH and LOADHIGH. See UMB.

UMB

Upper Memory Block. A block of memory in the Upper Memory Area (UMA) on a PC; TSRs and device drivers can sometimes be loaded into unused blocks of memory in this area, in order to make more space available in the conventional memory area (the first 640K on a PC).

UML

Unified Modeling Language. A notational language developed by Grady Booch, Ivar Jacobson, and Jim Rumbaugh, in cooperation with the Open Management Group (OMG), for simplifying the design of complex software, especially for object-oriented technology. UML enables the designer to visualize the overall project and make specifications as needed.

UMTS

Universal Mobile Telecommunications System.

unarchive

To bring an archived file back into active use, by decompressing it if necessary and moving it from long-term storage to an active disk.

UnArjMac

A Macintosh utility for decompressing files that have the .arj extension.

unary

Having to do with a single element or item; made up of one.

unary expression

An expression with only one operand.

unary operation

An operation with only one operand (entity that is operated on).

UNC

Uniform Naming Convention or Universal Naming Convention. A convention for specifying directories, servers, and other resources on a network, using two slashes // or backslashes to indicate the name of the server, and one slash to indicate the path or shared directory within the computer, in this format: servershare or //server/share.

uncompressor

A utility that restores a compressed file to its original size. Same as decompressor.

unconditional branch

A computer program instruction that transfers control to a different part of the program without requiring any decision.

undecillion

10^36 (U.S. and Canada); 10^66 (Europe).

undelete

To retrieve a file that was previously deleted. Some special software, such as Norton Utilities, helps in recovery of deleted files.

under construction

A sign often found on World Wide Web sites than means the site is not yet completed.

underflow

An error condition that results when a numeric value resulting from a computation is so small that the computer cannot use it to calculate with accuracy, or the number has more decimal places than will fit in the field. It can also mean an item has been called from an empty stack.

underline

ASCII character 95: _ ; also called underscore.

Undernet

An Internet Relay Chat network.

underscan

Inside of the normal viewing area on the monitor screen.

underscore

ASCII character 95: _ ; also called underline.

undetectable and untraceable fraud

(U2F). A major issue for information technology is fraud made possible by technology and electronic transactions, especially crimes that leave no trace and no audit trail.

undo

A command that undoes the last change made to a file. Some programs allow only an undo of the last change made; some allow the user to undo a series of edits, in sequence.

unencumbered virtual reality

A reality simulation that does not require a lot of equipment (such as goggles, gloves, etc.) to use it. For example, playing simulated basketball by interacting with a ball and basket on a computer screen. A video camera registers the player’s movements and shows them on the screen as if the player had actually hit the ball.

UNI

User to Network Interface. An interface between a user and a network.

unicast

Transmission from one terminal to another. Contrast with multicast, which is communication from one terminal to many.

Unicode

A character set that uses 16 bits (two bytes) for each character, and therefore is able to include more characters than ASCII, which is based on 8-bit characters. ASCII code can be used for only 256 characters, which is enough for English but not enough for languages that have more characters. Unicode can have 65,536 characters, and therefore can be used to encode almost all the languages of the world. Unicode includes the ASCII character set within it.

unicos

A version of UNIX used on Cray computers.

unidirectional

In only one direction; referring to a data channel that only transmits one way.

Uniface

An application development system from Compuware, for Macintosh, DOS, Windows, UNIX, and VMS.

unified messaging

A time-saving application tool that manages and integrates voice mail, e-mail, faxes, and pages, providing users with one convenient place to receive, view, and organize all messages.

Unified Modeling Language

(UML). A notational language developed by Grady Booch, Ivar Jacobson, and Jim Rumbaugh, in cooperation with the Open Management Group (OMG), for simplifying the design of complex software, especially for object-oriented technology. UML enables the designer to visualize the overall project and make specifications as needed.

Uniform Naming Convention

(UNC) Also called Universal Naming Convention. A convention for specifying directories, servers, and other resources on a network, using two slashes // or backslashes to indicate the name of the server, and one slash to indicate the path or shared directory within the computer, in this format: servershare or //server/share.

Unify

A relational database for UNIX, from Unify Corporation.

Unify Corporation

The company that developed Unify relational database.

uninstall

To remove installed software or hardware from the computer. Some applications must be removed with an uninstall program, which removes all files that were installed with the program and restores any modifications made to system files.

uninterruptible power supply

(UPS). A backup power supply that works when electrical power to the computer is interrupted. A small UPS can supply battery power for a few minutes so files can be saved and the computer can be shut down properly; a larger UPS can supply power for much longer.

Unipress Software, Inc.

A UNIX software company that develops applications and development tools and other products.

unique users

The number of different users who view a website within a certain time period. This is different from the number of hits, since each user could visit more than once. To identify unique users, a user registration or identification system is necessary.

Unisys Corporation

A worldwide computer company based in Blue Bell, Pennsylvania, formed from the merger of Burroughs Corporation and Sperry Corporation. Unisys supplies software and hardware from microcomputers to high-end mainframes, and is a major provider of information systems and services.

unit separator

(US). ASCII character 31: Control-_ .

UNIVAC I

Universal Automatic Computer. The world’s first electronic general purpose data processing computer, introduced in 1951, and used by the U.S. Census Bureau. UNIVAC 1 was designed and built by the Eckert-Mauchly Computer Corporation, which was later acquired by Remington Rand.

universal asynchronous receiver transmit

(UART). An integrated circuit which is used for transmitting and receiving data asynchronously via the serial port on the computer. It contains a parallel-to-serial converter for data transmitted from the computer and a serial-to-parallel converter for data coming in via the serial line. The UART also has a buffer for temporarily storing data from high-speed transmissions. See universal receiver transmitter.

Universal Character Set

(UCS). A character set using 16-bit character codes, also called ISO 10646. UCS is a standard defined by the International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC), and allows 65,536 (or 256 x 256) characters instead of the 256 available in ASCII. If a printer has the UCS feature, it can use a larger range of characters. The 8-bit character sets ASCII and ISO Latin 1 are subsets within UCS.

Universal Debugger

(udb). An interactive source level debugger from Kendall Square Research (KSR), used for testing and debugging serial and parallel programs written in KSR, Fortran, and some other languages.

Universal Disk Format

(UDF). The volume format of DVD disks.

Universal Naming Convention

(UNC) Also called Uniform Naming Convention. A convention for specifying directories, servers, and other resources on a network, using two slashes // or backslashes to indicate the name of the server, and one slash to indicate the path or shared directory within the computer, in this format: servershare or //server/share.

universal product code

(UPC). The bar code commonly found on products in retail stores, which identifies each product and makes it easy for the cashier to ring up its price. The code is read into the computer by passing it over a scanner.

universal receiver transmitter

(URT). A circuit which is used for synchronous, asynchronous, or combined synchronous/asynchronous communications, and which contains a serial-to-parallel converter for data transmitted out of the computer and a parallel-to-serial converter for data coming in. Different word lengths can be used.

universal resource locator

(URL). An Internet address which tells a browser where to find an Internet resource. For example, the URL for Computer Currents Interactive is http://www.currents.net/.

Universal Serial Bus

(USB). A personal computer bus, compatible with recently-developed Intel chips, that works at 12 Mbps and can link up to 127 peripherals in a daisy chain.

universal synchronous receiver transmitt

(USRT). A circuit which is used for synchronous data communications via the serial port on a computer. It converts data into serial form for transmission. See universal receiver transmitter and universal asynchronous receiver transmitter.

universal synchronous/asynchronous recei

(USART). A circuit which is used for synchronous or asynchronous data communications. See USRT, UART, and URT.

Universal Time Coordinated

(UTC). The same as Greenwich Mean Time (GMT). The mean solar time of the meridian of Greenwich, England, used as the basis for calculating standard time throughout the world.

UNIX

A multi-user, multitasking operating system developed by Ken Thompson, Dennis Ritchie, and others and originally licensed by AT&T's Bell Laboratories. It was originally designed for minicomputers, then revised for use on mainframes and personal computers. There are now many versions of UNIX which can be used on many different platforms. UNIX is written in the C programming language, which was also developed at AT&T. Because it allows multiple programs to run simultaneously and multiple users to access a single computer, it has been used by universities and businesses where many people use the same computer. It is the most commonly used operating system for Internet nodes.

Unix International

(UI). An association that promoted an open computing environment based on UNIX System V. It disbanded in 1993 when Novell bought UNIX.

UNIX shell account

A dialup account with an Internet Service Provider that requires the user to enter UNIX commands via a command-line interface.

UNIX Software Operation

(USO). The division of AT&T responsible for developing UNIX until it became UNIX System Laboratories (USL) in 1990.

UNIX System Laboratories

(USL). The division of AT&T which was responsible for UNIX from 1990 until it was acquired by Novell in 1993.

UNIX Systems Group

(USG). The division of Novell concerned with UNIX and UNIX products.

UNIX-to-UNIX Copy

(UUCP). A UNIX protocol that makes it possible to copy a file from one UNIX computer to another via a telephone line or direct connection. It is used for Usenet news and electronic mail. Unlike TCP/IP, UUCP requires that a session be established between the two computers in order to transfer files.

UnixWare

An implementation of UNIX System 5 released by Novell.

unload

1. To remove a disk or tape from a drive. 2. To remove a loaded program from memory. 3. To remove data from a disk or other storage device.

unmark

To deselect a selected item, group of items, or area of text.

unpack

To open a file which has been compressed with a data compression program, returning it to its original size. Data compression programs have corresponding software for unpacking compressed files when necessary; some compressed files are self-extracting.

unpacked decimal format

A form of binary decimal notation in which each decimal digit corresponds to one byte. See packed decimal format.

unshar

A UNIX utility for unpacking archives (shar files) from email and news messages.

unshielded twisted pair

(UTP). The cable used for most telephone wire, and is also used for some computer-to-computer communications. It contains pairs of unshielded wires twisted together, and is a cheap and fairly noise-free way to transmit signals. In shielded twisted pair cables, each pair has a metal sheath around it for protection against interference. Unshielded twisted pair lacks the sheath, but has the advantage of being more flexible and thinner.

unsmiley

An emoticon that is frowning or not smiling :-( rather than a smiley :-) .

unsolicited bulk e-mail

(UBE). Unsolicited bulk e-mail , or spam, is an attempt by a company to get others to pay for its advertising. The costs of this kind of e-mail are paid not by the company but by the Internet service provider and ultimately by the end-user. Spam is seldom used by reputable companies. Most bulk e-mail consists of chain letters, pyramid schemes, MMF (“make money fast”) schemes, advertisements for pornographic sites, offers of software for collecting e-mail addresses and sending unsolicited commercial e-mail, stock offers for unknown startup companies, etc.

unspecified bit rate

(UBR). Asynchronous transfer mode (ATM) service in which available bandwidth is not guaranteed.

unzip

To return a zip file (a file which has been compressed with PKZIP) to its original size (with PKUNZIP or UnZip).

up

Working; for example, a computer system is “up” if it is running.

up arrow

A keyboard key which has a picture on it of an arrow pointing upward; it moves the cursor up the page.

UPC

Universal Product Code. The bar code commonly found on products in retail stores, which identifies each product and makes it easy for the cashier to ring up its price. The code is read into the computer by passing it over a scanner.

update

The change the data in a file in order to make the data current.

upgrade

1. A newer, presumably better, version of hardware or software. 2. To make a new version of a product. 3. To install a new version of hardware or software.

uplink

1. In satellite communications, a link from an earth station to an orbiting body. 2. To transmit communications via an uplink.

upload

To transfer files or data from one computer to another. To download means
to receive; to upload means to transmit.

upper case

The capital letters on the keyboard.

upper letter row

The upper letter row (row of letter keys) on a keyboard.

Upper Memory Area

(UMA). In a PC, the memory area between 640K and 1024K. Under DOS, this memory area is ordinarily designated for use by the ROM BIOS and display, and is unavailable for use by other programs. However, some of the free memory in this area can be used for device drivers or TSRs by implementing the commands DEVICEHIGH and LOADHIGH. See Upper Memory Block.

Upper Memory Block

(UMB). A block of memory in the Upper Memory Area (UMA) on a PC; TSRs and device drivers can sometimes be loaded into unused blocks of memory in this area, in order to make more space available in the conventional memory area (the first 640K on a PC).

uppercase

Capital; referring to letters on the keyboard.

UPS

Uninterruptible Power Supply. A backup power supply that works when electrical power to the computer is interrupted. A small UPS can supply battery power for a few minutes so files can be saved and the computer can be shut down properly; a larger UPS can supply power for much longer.

upsizing

Moving from the use of small computer systems to larger ones.

upstream

1. The direction of data moving from a client to a Web server. 2. A reference to actual data that is moving from individual computers to servers. It is important to note that upstream differs from downstream due to their different transfer rates; for example, cable modems transfer data up to 30 Mbps downstream, but opnly 128 Kbps to 2 Mbps upstream.

upthread

Earlier in the discussion, in a newsgroup following a topic thread.

uptime

The time during which a computer system is operational, in contrast with downtime.

upward compatible

Describes software that is compatible with later versions of the same program. Also called forward compatible.

urban legend

A story which is not true, or only partially true, but which circulates widely and becomes a part of popular mythology. Many urban legends are propagated on the Internet, and some will go the rounds again and again.

URI

Character string that can identify any kind of resource on the Internet, including images, text, video, audio and programs. Most commom version of a URI is a URL.

URL

Uniform Resource Locator (formerly Universal Resource Locator). An Internet address which tells a browser where to find an Internet resource. For example, the URL for Computer User is http://www.computeruser.com/.

URT

Universal Receiver Transmitter. A circuit which is used for synchronous, asynchronous, or combined synchronous/asynchronous communications, and which contains a serial-to-parallel converter for data transmitted out of the computer and a parallel-to-serial converter for data coming in. Different word lengths can be used.

US

Unit Separator. ASCII character 31: Control-_ .

US legal

The standard size of paper used for legal documents in the United States, 8.5" x 14."

US letter

The standard size of business letters in the United States, 8.5" x 11."

USART

Universal Synchronous/Asynchronous Receiver Transmitter. A circuit which is used for synchronous or asynchronous data communications. See USRT, UART, and URT.

USB

Universal Serial Bus. A personal computer external bus standard which can support up to 127 peripheral devices in a daisy chain configuration, can support plug-and-play (hot plugging), and has a total bandwidth of 1.5 megabytes per second. It uses inexpensive cable, which can be up to 5 meters long.

Usenet

Users’ Network. A giant public bulletin board system on the Internet for news and electronic mail. Usenet was started in 1979 by graduate students at Duke University and the University of North Carolina, using the UUCP communications protocol. It now has over 12,000 discussion areas which cover every imaginable topic are read by millions of people all over the world. Messages and news articles are posted and users respond by email. In hot discussion areas, hundreds of messages a day may be posted. Types of Usenet groups are comp (about computers), news (about newsgroups), rec (on sports and hobbies), sci (science), soc (social), talk (discussions), misc (miscellaneous), and alt (alternative newsgroups).

Usenetter

Someone who spends a lot of time on Usenet.

USENIX

A nonprofit membership association supporting education, innovation, and research in UNIX, UNIX-like systems, open systems, and other advanced technologies. USENIX sponsors conferences, publications, tutorials, and special technical groups.

user

An individual who uses a computer, program, network, or related service for work or entertainment; usually there is a distinction between a user and a programmer or other person who works with the computer on an expert or technical level.

user agent

(UA). An OSI application process that can represent a human user or an organization to the X.400 Message Handling System. The user agent creates, sends, and receives messages for the user.

user area

A memory area that is designated for user data.

User Datagram Protocol

(UDP). A communications protocol for the Internet network layer, transport layer, and session layer, which makes it possible to send a datagram message from one computer to an application running in another computer. Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol). Unlike TCP, UDP is connectionless and does not guarantee reliable communication; the application itself must process any errors and check for reliable delivery.

user group

A group of people who use a particular kind of computer. One of the best sources of advice and help a newbie can find on what software to get, how to run programs, etc., is the members of a user group. User groups often sponsor Bulletin Board Services or have Internet sites, and have meetings for anyone interested. Other benefits of user groups are software libraries, freeware downloads, information on upgrades, and special interest groups on many topics. Examples of user groups are UUGs (Unix User Groups) and MUGs (Macintosh User Groups).

user interface

(UI). The means by which a user interacts with a computer. The interface includes input devices such as a keyboard, mouse, stylus, or microphone; the computer screen and what appears on it; the way commands are given, etc. With a command-line interface, only text appears on the screen, and the user must type in commands; with a graphical user interface, windows, mice, menus, and icons are used to communicate with the computer.

User Interface Management System for X W

(UIMX). Interface design software from Visual Edge Software, Ltd., for Motif and Open Look.

user name

A name that identifies a user on a network or online service, in addition to the user's password. The user name is commonly chosen by the user.

user to network interface

(UNI). An interface between a user and a network.

user-defined

Defined by the user; the user can designate formats, dictionaries, styles, and many other parameters on the computer.

user-friendly

Easy to learn and use, especially for people who are not experts. This term is most often used to describe software.

user-obsequious

Overly user-friendly.

username

An individual name of a user on a computer network, which is used for login. It is often the first initials and last name: jmjones. The username is also the part of an email address before the @ symbol: [email protected]

USG

UNIX Systems Group. The division of Novell concerned with UNIX and UNIX products.

USL

UNIX System Laboratories. The division of AT&T which was responsible for UNIX from 1990 until it was acquired by Novell in 1993.

USO

UNIX Software Operation. The division of AT&T responsible for developing UNIX until it became UNIX System Laboratories (USL) in 1990.

usr

User. The area on a UNIX system designated for user directories and files, indicated as /usr.

USR

U.S. Robotics, Inc. A modem manufacturer in Skokie, Illinois.

USRT

Universal Synchronous Receiver Transmitter. A circuit which is used for synchronous data communications via the serial port on a computer. It converts data into serial form for transmission. See universal receiver transmitter and universal asynchronous receiver transmitter.

UTC

Universal Time Coordinated. The same as Greenwich Mean Time (GMT). The mean solar time of the meridian of Greenwich, England, used as the basis for calculating standard time throughout the world.

utility

A small helper program. Utilities are distinguished from application programs, which are used to do the main work of the computer (such as word processing, accounting, CAD), and system programs, which control the computer and run application programs. Some examples of utilities are screensavers, font managers, compression programs, and file finders.

UTP

Unshielded Twisted Pair. The cable used for most telephone wire, and is also used for some computer-to-computer communications. It contains pairs of unshielded wires twisted together, and is a cheap and fairly noise-free way to transmit signals. In shielded twisted pair cables, each pair has a metal sheath around it for protection against interference. Unshielded twisted pair lacks the sheath, but has the advantage of being more flexible and thinner.

Utra DMA

(UDMA). A protocol developed by Quantum Corporation and Intel for disk drives that enables the computer to take advantage of the fast Ultra ATA disk drives. UDMA/33 is twice as fast as the previous disk drive standard for PCs, supporting burst mode data transfer rates of 33.3 MBps. A further improvement is UDMA/66. See DMA.

UTSL

Use The Source Luke (meaning read the source code). (From Star Wars, "Use the Force, Luke.")

UU Undo

A utility that can decode uuencoded files on MacOS systems.

UUCP

UNIX-to-UNIX Copy. (Also called UNIX-to-UNIX Copy Program or UNIX-to-UNIX Copy Protocol). A UNIX protocol that makes it possible to copy a file from one UNIX computer to another via a telephone line or direct connection. It is used for Usenet news and electronic mail. Unlike TCP/IP, UUCP requires that a session be established between the two computers in order to transfer files.

UUCPNet

A network of UNIX machines around the world, on which UUCP is used for electronic mail transfer and Usenet news.

uudecode

A UNIX program that decodes uuencode files from ASCII format back to binary.

uuencode

A UNIX program that encodes binary data, 8-bit text files, and some other file formats into 7-bit ASCII files for transmission over the Internet and via e-mail. It was originally used with UUCP. The uudecode program converts the files back into their original format. Uuencoded files have .uu or .uue as a suffix.

uuencoding

A method of encoding binary data, 8-bit text files, and some other file formats into 7-bit ASCII files for transmission over the Internet. This method of encoding is common for files that are non-Macintosh or not platform-specific such as GIFs. With Mac files, uuencoding can leave out critical information, because it only encodes the data fork and strips off the resource fork; with Mac files, BinHex encoding is therefore preferred. Uuencoded files have .uu or .uue as a suffix, and can be decoded by uudecode.

UUG

Unix User Group. There are UUGs worldwide; for example, European Unix User Group (EUUG).

UUNET

(UNIX to UNIX Network). The first Internet access provider, founded in 1987 in Fairfax, Virginia, and now a full-service provider.

UUPC

UUCP (UNIX to UNIX Copy Protocol) for PCs.

UV

Ultraviolet. An invisible band of radiation having a wavelength less than 400 nanometers; beyond the visible spectrum at the violet end. Ultraviolet radiation has a wavelength shorter than visible light and longer than X-rays.

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