[Glossary] [Home]  Glossary: R  A software technique to simulate
the effects of light diffusion and add shading to objects in
computer graphic images that seem sharper than reality.  random
access memory (RAM) The primary internal storage device of a
personal computer, where programs and data are kept during
processing.  A set of adjacent row or column cells treated as a
unit, for example, to be placed in a function to get a sum of
cell values in a column. Specifying a range of cells eliminates
the need to list all of them individually.  rapid applications
development (RAD) tools Programming environments with objects,
graphical interfaces, and superior debugging features for rapid
prototyping of applications. Both Delphi and Visual BASIC fall
into this category.  A term for the horizontal lines of pixels
on a TV or CRT screen, refreshed at a rate of 30 times a second
to display an image on the screen.  raster graphics A common
method of presenting computer graphic images on a CRT, based on
the technology of t