(1) Also known as stealth, a technique used by some Web sites to deliver one page to a search engine for indexing while serving an entirely different page to everyone else. There are opposing views as to whether or not cloaking is ethical. Opponents see it as a bait-and-switch, where a Web server is scripted to look out for search engines that are spidering in order to create an index of search results. The search engine thinks it is selecting a prime match to its request based on the meta tags that the site administrator has input. However, the search result is misleading because the meta tags do not correspond to what actually exists on the page. Some search engines, such as Lycos, Hotbot and Excite, even ban cloaked Web sites. Proponents of cloaking assert that cloaking is necessary in order to protect the meta data, as only the spider is supplied with the meta tags.
- clock gating
Clock gating is one of the power-saving techniques used on the Pentium 4 processor. To save power, clock gating refers to activating the clocks in a logic block only when there is work to be done. From the earliest days of the Pentium 4 processor design, power consumption was a concern. The clock gating concept […]
- Clock Speed
Also called clock rate, the speed at which a microprocessor executes instructions. Every computer contains an internal clock that regulates the rate at which instructions are executed and synchronizes all the various computer components. The CPU requires a fixed number of clock ticks (or clock cycles) to execute each instruction. The faster the clock, the […]
- clock tick
Same as a cycle, the smallest unit of time recognized by a device. For personal computers, clock ticks generally refer to the main system clock, which runs at 66 MHz. This means that there are 66 million clock ticks (or cycles) per second. Since modern CPUs run much faster (up to 3 GHz), the CPU […]
- clock tripling
The process used on some older 486 computers to triple the internal processing speed of the CPU while maintaining the manufacturer’s original clock speed for I/O transfers. In most cases, clock-tripling would normally yield a lower than 100 percent overall system performance boost (e.g., 30 to 70 percent), not an actual tripling of the clock […]
A computer, software product, or device that functions exactly like another, better-known product. In practice, the term refers to any PC not produced by one of the leading name-brand manufacturers, such as IBM and Compaq.