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U CKInfo Items

Computer Knowledge information pages for terms starting with the letter U.

UAC - User Account Control

(U-A-C) A security feature introduced in Windows Vista, the operating system designed to follow Windows XP. Basically, UAC will run most programs in a restrictive context instead of administrative context. Most users set their computer up so that ...

UART - Universal Asynchronous Receiver/Transmitter

(you-art) The main part of a serial port is called a Universal Asynchronous Receiver/Transmitter (UART). This device on a chip takes the parallel information from the computer and translates it into serial data for the link. At the receiving end a...

UCITA - Uniform Computer Information Transaction Act

(U-C-I-T-A) A law being considered by states in the USA. Essentially, the law validates software licenses and gives them significant power. Significant controversy exists about the terms of this law. More Information UCITA Site

UDDI - Universal Description, Discovery and Integration

(U-D-D-I) A Web services XML-based message protocol being developed by Ariba, IBM, Intel, Microsoft, and SAP. UDDI is like a phone book: there are "white pages" for basic contact info, "yellow pages" for descriptions of capabilities, and "green pa...

UDP - User Datagram Protocol

(U-D-P) A simple protocol the provides for datagrams (packets of information) to be sent from one computer to another. UDP does not guarantee arrival or arrival in the correct order. More Information RFC 768

UIN - Universal Internet Number

(U-I-N) A unique number provided to identify you when you register at an ICQ server. You may associate personal information with your UIN (or not) and other users recognize you by that number. More Information ICQ WhatIs Page

ULSI - Ultra Large Scale Integration

(U-L-S-I) A term that roughly defines placement of a million elements on a single chip. More Information Digital Logic Processor Discussion

UltraATA - Ultra AT Attachment

(ultra-A-T-A) An improved version of the ATA specification. More Information Western Digital Discussion

UltraDMA - Ultra Direct Memory Access

(ultra-D-M-A) A DMA version that is twice as fast as the original. More Information Board Specifications

UMB - Upper Memory Block

(U-M-B) Used to describe sections of memory that reside between 640K and 1MB. Sections of this memory are set aside for specific tasks (e.g., video area) but much is unused. UMB blocks are used for expanded memory (see EMS) and other tasks. More ...

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