Real Time
Occurring immediately. The term is used to describe a number of different computer features. For example, real-time operating systems are systems that respond to input immediately. They are used for such tasks as navigation, in which the computer must react to a steady flow of new information without interruption. Most general-purpose operating systems are not real-time because they can take a few seconds, or even minutes, to react.
Real time can also refer to events simulated by a computer at the same speed that they would occur in real life. In graphics animation, for example, a real-time program would display objects moving across the screen at the same speed that they would actually move.
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A clock that keeps track of the time even when the computer is turned off. Real-time clocks (RTCs) run on a special battery that is not connected to the normal power supply. In contrast, clocks that are not real-time do not function when the computer is off. Do not confuse a computer’s real-time clock with […]
- rear screen TV
A rear screen TV uses a projection screen in place of a CRT to display images. Rear screen TVs offer high resolution, bright colors, and newer models use high quality screens that allow for many viewing angles.
- reboot
To restart a computer. In DOS, you can reboot by pressing the Alt, Control and Delete keys simultaneously. This is called a warm boot. You can also perform a cold boot by turning the computer off and then on again. On a PC running Microsoft Windows you reboot by selecting the “Shut Down” option from […]
- recalculate
In spreadsheet programs, recalculation refers to computing the values of cells in a spreadsheet. Recalculation is necessary whenever you change a formula or enter new data into one or more cells. Depending on the size and complexity of your spreadsheet, recalculation can be a time-consuming process. One criterion for evaluating spreadsheet programs, therefore, is how […]
- reciprocal link
(re��cip��ro��cal) Interchanged, given, or owed to each other: i.e. reciprocal agreements A reciprocal link is an agreement between two webmasters to provide a hyperlink within their own website to each other’s web site. Generally this is done to provide readers with quick access to related sites, or to show a partnership between two sites. Reciprocal […]