)A technique used by virtual memory operating systems to help ensure that the data you need is available as quickly as possible. The operating system copies a certain number of pages from your storage device to main memory. When a program needs a page that is not in main memory, the operating system copies the required page into memory and copies another page back to the disk. One says that the operating system pages the data. Each time a page is needed that is not currently in memory, a page fault occurs. An invalid page fault occurs when the address of the page being requested is invalid. In this case, the application is usually aborted.
This type of virtual memory is called paged virtual memory. Another form of virtual memory is segmented virtual memory.
- paid search
A type of contextual advertising where Web site owners pay an advertising fee, usually based on click-throughs or ad views to have their Web site search results shown in top placement on search engine result pages. Some search engines will make it easy for users to determine which search results are natural and which are […]
- paint program
A graphics program that enables you to draw pictures on the display screen which are represented as bit maps (bit-mapped graphics). In contrast, draw programs use vector graphics (object-oriented images), which scale better. Most paint programs provide the tools shown below in the form of icons. By selecting an icon, you can perform functions associated […]
- painting tool
In graphics and image-editing programs the painting tool changes the area of your image where you use the cursor to add paint strokes to the image. You can use this tool to do tasks such as fill in single pixels, add hard or soft lines, or select areas to fill with a solid color. Some […]
(1) In computer graphics, a palette is the set of available colors. For a given application, the palette may be only a subset of all the colors that can be physically displayed. For example, a SVGA system can display 16 million unique colors, but a given program would use only 256 of them at a […]
A small computer that literally fits in your palm. Compared to full-size computers, palmtops are severely limited, but they are practical for certain functions such as phone books and calendars. Palmtops that use a pen rather than a keyboard for input are often called hand-held computers or PDAs. Because of their small size, most palmtop […]