Clipboard
A special file or memory area (buffer) where data is stored temporarily before being copied to another location. Many word processors, for example, use a clipboard for cutting and pasting. When you cut a block of text, the word processor copies the block to the clipboard; when you paste the block, the word processor copies it from the clipboard to its final destination. In Microsoft Windows and the Apple Macintosh operating system, the Clipboard (with a capital C) can be used to copy data from one application to another.
The Macintosh uses two types of clipboards. The one it calls the Clipboard can hold only one item at a time and is flushed when you turn the computer off. The other, called the Scrapbook, can hold several items at once and retains its contents from one working session to another.
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- cloaking
(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 […]
- 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 […]