(Pronounced kwer-tee). QWERTY refers to the arrangement of keys on a standard English computer keyboard or typewriter. The name derives from the first six characters on the top alphabetic line of the keyboard.
Arrangement of Characters
The arrangement of characters on a QWERTY keyboard was designed in 1868 by Christopher Sholes, the inventor of the typewriter. According to popular myth, Sholes arranged the keys in their odd fashion to prevent jamming on mechanical typewriters by separating commonly used letter combinations. However, there is no evidence to supportthis assertion, except that the arrangement does, in fact, inhibit fast typing.
With the emergence of ball-head electric typewriters and computer keyboards, on which jamming is not an issue, new keyboards designed for speed typing have been invented. The best-known is called a Dvorak keyboard. Despite their more rational designs, these new keyboards have not received wide acceptance. The AZERTY keyboard is the French version of the standard QWERTY keyboard.
Short for Quantum Extended Graphics Array, a display specification that is capable of supporting 2048 x 1536 resolution, or approximately 3.2 million pixels.
Q.931 is an ISDN connection control protocol, roughly comparable to TCP in the Internet protocol stack. Q.931 doesn’t provide flow control or perform retransmission, because the underlying layers are assumed to be reliable and the circuit-oriented nature of ISDN allocates bandwidth in fixed increments of 64 kbps. Q.931 does manage connection setup and breakdown. In […]
Short for Quality of Experience in telecommunications terminology, it is a measurement used to determine how well that network is satisfying the end user’s requirements. In contrast to Quality of Service (QoS) a measurement of network operating conditions such as noise, crosstalk, or lost or dropped packets, in telecommunications terminology, QoE takes into consideration the […]
Short for Quality of Service, a networking term that specifies a guaranteed throughput level. One of the biggest advantages of ATM over competing technologies such as Frame Relay and Fast Ethernet, is that it supports QoS levels. This allows ATM providers to guarantee to their customers that end-to-end latency will not exceed a specified level.
The underlying graphics display system for Apple Macintosh computers. The QuickDraw system enables programs to create and manipulate graphical objects. Because all Macintosh programs use QuickDraw, they all share a common look. There are several versions of QuickDraw that offer different color capabilities and other features. The newest, called QuickDraw GX, supports 16.7 million colors. […]