Glossary: Glossary

Glossary

$GEOREF format: a geometric coordinate data arrangement that stores all the spatial information as a geometry object contained in a single variable. This format, which is used by feature tables, references the geometry objects that encapsulate the points, lines, and polygons necessary to render a map.
absolute coordinate: a coordinate that is measured from the origin of a coordinate system.
ActiveX: a Microsoft proprietary (COM) component used to display an interactive graph. The output is stored in a single file.
ActiveX control: a type of Web application that is developed specifically for the Windows operating environment. ActiveX controls can provide Web users with interactive capabilities.
area bar chart: a bar chart that applies an additional magnitude of width to the bars that results in categorized bars each with a height measure and a width measure that can be independent of each other.
aspect ratio: the ratio of a shape's width to its height in an output area such as a display, plotter, or film recorder.
attribute: a characteristic of a graphics element such as color, line type, text font, text justification, and fill pattern.
axis: a line with data values indicated by tick marks as a reference to a data value or range of values. Graphs can support more than one axis, in which case, the axes are usually perpendicular. Axis refers collectively to the axis line, the major and minor tick marks, the major tick mark values, and the axis label. See also Cartesian coordinate system.
axis area: an area bounded by axes. In SAS/GRAPH software, this area might be enclosed by an axis frame.
background: a plane on which graphics are displayed such that they appear behind or beneath objects in the foreground.
baseline: in a font, the imaginary line upon which the characters rest.
block map: a three-dimensional map that uses blocks of varying heights to represent the value of a variable for each map area.
border: a line that is drawn around an entire graphics output area. This area usually includes the title and footnote areas as well as the procedure output area. See also frame.
boundary: in the GMAP procedure, a separating line or point that distinguishes between two or more unit areas or segments.
capline: the highest point of a normal uppercase letter. In some fonts, the capline might be above the top of the letter to allow room for an accent.
Cartesian coordinate system: the two- or three-dimensional coordinate system in which perpendicular axes meet at the origin (0,0) or (0,0,0). Typically, Cartesian coordinate axes are called X, Y, and Z.
cell: in traditional SAS/GRAPH procedures, a unit of measure that is defined by the number of rows and the number of columns in the graphics output area. In ODS Graphics, a cell refers to a distinct rectangular sub-region of a graph that contains plots, text, or legends. See also aspect ratio.
center point: the location in the GRAPH window that, in conjuction with a radius point, defines the placement and shape of an ellipse or a pie.
CGM: See computer graphics metafile.
character up vector: in SAS/GRAPH software, the angle at which a character is positioned. The character up vector has two components, x and y, which determine the angle.
chart: a graph in which graphical elements, such as bars or pie slices, represent a view of the data.
chart statistic: the statistical value calculated for the chart variable: frequency, cumulative frequency, percentage, cumulative percentage, sum, or mean.
chart variable: a variable in the input data set whose values are categories of data represented by bars, blocks, slices, or spines.
chart vertices: points on a radar chart where the statistical values intersect the spokes.
choropleth map: a two-dimensional map that uses color and fill pattern combinations to represent different categories or levels of magnitude.
classification variable: a variable that is used to group (or classify) data. A classification variable can be either character or numeric values. Classification variables include group, subgroup, category, and BY variables.
CMYK: A color coding scheme that specifies a color in terms of the levels of cyan, magenta, yellow, and black components. The level of each component ranges from 0 to 255.
color list: in SAS/GRAPH software, the list of foreground colors available for the graphics output. The color list is either the default list established from the style, the list created from the device entry, or the list established from the colors specified with the COLORS= graphics option.
color map: in SAS/GRAPH software, a table that is used to translate the original colors in graphics output to different colors when replaying graphics output using the GREPLAY procedure. The table is contained in a catalog entry.
color, predefined: one of the set of colors for which SAS/GRAPH software defines and recognizes names (for example, BLACK, BLUE, and CYAN).
color, user-defined: in SAS/GRAPH software, a color expressed in RGB, HLS, or gray-scale format.
computer graphics metafile: a graphics output file written in the internationally recognized format for describing computer graphics images. This standardization allows any image in a CGM to be imported and exported among different systems without error or distortion. Short form: CGM.
confidence limits: the upper and lower values of a (usually 95%) confidence interval. In repeated sampling, approximately (1-alpha) 100% of the resulting intervals would contain the true value of the parameter that the interval estimates (where alpha is the confidence level associated with the interval).
contour plot: a three-variable plot that uses line styles or patterns to represent levels of magnitude of z corresponding to x and y coordinates.
coordinate: a value that represents the location of a data point or a graphics element with respect to a coordinate system.
coordinate system: the context in which to interpret coordinates. Coordinate systems vary according to their origin, limits, and units.
data area: the portion of the graphics output area in which data values are displayed. The data area is bounded by axes or map areas. In the Annotate facility, the data area defines a coordinate system. See also graphics output area, procedure output area, and coordinate system.
data tip: data or other detailed information that is displayed when a user positions a mouse pointer over an element in a graph. For example, a data tip typically displays the data value that is represented by a bar, a plot point, or some other element.
density value: a value assigned to each observation in a map data set reflecting the amount of detail (resolution) contributed by the observation.
dependent variable: a variable (response variable) whose value is determined by the value of another variable or by the values of a set of variables in a statistical model.
device driver: in SAS/GRAPH software, a routine that generates the specific machine-language commands needed to display graphics output on a particular device. SAS/GRAPH device drivers take device-independent graphics information produced by SAS/GRAPH procedures and create the commands required to produce the graph on the particular device.
device entry: a SAS catalog entry that stores the values of device parameters (or the characteristics) that are used with a particular output device. A device entry is a SAS catalog entry of type DEV.
device map: a catalog entry used to convert the SAS/GRAPH internal encoding for one or more characters to the device-specific encoding needed to display the characters in hardware text on a particular graphics output device. See also hardware character set.
device parameter: a value in a device entry that defines a default behavior or characteristic of a device driver. Some device parameters can be overridden by graphics options. See also graphics option.
device-independent catalog entry: a SAS catalog entry that contains graphics output in a generic format (not device-specific). A device-independent catalog entry can be replayed on any device supported by SAS/GRAPH software. See also device-dependent catalog entry.
device-resident font: a font stored in an output device.
document file: a file output by the Output Delivery System (ODS) that contains an image or is used to view an image. Examples include HTML, PDF, RTF, SVG, and PostScript files.
drill down: to select an element in an image in order to display additional information about that element, generally by displaying another Web page or another section in the same Web page.
end angle: for an ellipse, the measure in degrees from the major axis to the trailing edge.
export: in SAS/GRAPH software, to put a SAS catalog entry containing graphics output into a format that can be moved to another software product.
feature table: A SAS data set that uses the $GEOREF format to store geometric coordinates for each unique map area in a single variable value.
fill color: the color of a pattern in a filled, closed graphics object, such as a bar segment, a pie slice, or a map area.
font: a complete set of all the characters of the same design and style. The characters in a font can be figures or symbols as well as alphanumeric characters. See also type style.
font maximum: in the GFONT procedure, the highest vertical coordinate in a font.
font minimum: in the GFONT procedure, the lowest vertical coordinate in a font.
font units: in the GFONT procedure, units defined by the range of coordinates specified in the font data set. For example, a font in which the vertical coordinates range from 10 to 100 has 90 font units.
font, device-resident: a font stored in an output device.
font, SAS/GRAPH: a font stored in the SASHELP.FONTS catalog, and a font created by the user and stored in a GFONTn catalog. These fonts can be used only by SAS/GRAPH procedures or other procedures that generate GRSEG output files. Examples of SAS/GRAPH fonts include Swiss, Simulate, and Marker. These fonts are provided for specialized purposes only.
font, system: a font that can be used by any SAS procedure and by other software, such as Microsoft Word.
frame: in SAS/GRAPH software, a box enclosing a group of graphics elements. In GSLIDE procedure output, the frame encloses the procedure output area. In GPLOT, GCHART, GBARLINE, and GCONTOUR procedure output, the frame encloses the axis area. In a legend, the frame encloses the legend label and entries. See also border.
FreeType font-rendering: a method of rendering fonts that uses the FreeType engine to access the content of font files in order to render high-quality fonts for ODS and SAS/GRAPH. The FreeType engine can be used in all SAS operating environments.
geocoding: the process of adding geographic coordinates (latitude and longitude values) to an address. Each pair of coordinates can represent either the center of a region or a specific point.
geo-variable: in a feature table, the $GEOREF formatted variable that stores the spatial information as a geometry object. When a feature table is used, this variable is specified in the ID statement of the GMAP procedure.
global statement: a SAS statement that you can specify anywhere in a SAS program.
graph: a visual representation of data showing the variation of a variable in comparison to one or more other variables.
graphics element: a discrete visual part of a picture. For example, a bar in a chart and a plot's axis label are both graphics elements.
graphics object: a discrete visual element of a graph or picture (for example, a bar in a chart, a polygon, a plot's axis, and so on).
graphics option: in a SAS GOPTIONS statement, an option that controls some attribute of the graphics output. The specified value remains in effect only for the duration of the SAS session. Some graphics options override parameters that have been specified for a graphics output device.
graphics output: output from a graphics program that can be stored as a catalog GRSEG entry or as a graphics stream file. Graphics output can be displayed or printed on a graphics output device. See also device-dependent catalog entry, device-independent catalog entry, and graphics output device.
graphics output area: the area of a graphics output device where the graphics output is displayed or drawn. Typically, the graphics output area occupies the full drawing area of the device, but the dimensions of the graphics output area can be changed with graphics options or device parameters. See also procedure output area and graphics output device.
graphics output device: any terminal, printer, or other output device that is capable of displaying or producing graphical output.
graphics output file: a file that contains bitmapped or vector graphic information.
graphics primitive: a function that draws a graphics element.
graphics stream file: a file that contains device-dependent graphics commands from a SAS/GRAPH device driver. This file can be sent to a graphics device or to other software applications. Short form: GSF.
gray scale: a color-coding scheme that specifies a color in terms of gray components. Gray-scale color codes are commonly used with some laser printers and PostScript devices.
grid point: a grid location in the GRAPH window that is marked by a dot. Grid points are used for precision placement of objects.
grid request: in the G3GRID procedure, the request specified in a GRID statement that identifies the horizontal variables that identify the x, y plane and one or more z variables for the interpolation.
group variable: a variable in the input data set used to categorize chart variable values into groups.
GRSEG: a SAS catalog entry that contains graphic output in a generic format (not device-specific).
GSF: See graphics stream file.
handshaking: the exchange of signals between two devices over an interface for control or synchronization purposes. Data flow control is needed to ensure that data are not sent faster than the receiving device can process them. Handshaking usually involves sending signals between the device and the host computer in order to start and stop transmission of data.
hardware (or hardwire) handshaking: a method of data flow control in which the flow of data between the computer and device is regulated by signals sent over separate wires in the connecting cable. See also handshaking.
hardware character set: a set of character definitions held internally in a graphics output device. When a hardware character set is used, SAS/GRAPH software does not have to send the device all the commands to draw characters, only the corresponding character codes. Some devices have more than one hardware character set. See also font and device-resident.
hatch: a fill pattern consisting of parallel lines at any specified angle.
HLS: a color-coding scheme that specifies a color in terms of its hue, lightness, and saturation components. Hue is the color, lightness is the percentage of white, and saturation is the attribute of a color that determines its relative strength and its departure from gray. Lightness and saturation added to the hue produce a specific shade. See also RGB.
host computer: a workstation or minicomputer accessed by a terminal or another workstation.
host font-rendering: a method of rendering fonts that relies on the capabilities of the operating environment.
HSV (HSB): a color-coding scheme that specifies a color in terms of its hue, saturation, and value (brightness) components. Hue is the color. Saturation is the aspect of a color that determines its relative strength and departure from gray. And value (brightness) is the color's departure from black.
identification variable: a variable common to both the map data set and the response data set that the GMAP procedure uses to associate each pair of map coordinates and each response value with a unique map area.
image file: a file that contains bitmapped graphic information. Examples include GIF, PNG, TIFF, and JPEG files. Image files are a subset of graphics output files.
image map: a diagram that associates graphic elements with HTML links to implement drill-down functionality. The graphic elements are represented by sets of coordinates. SAS/GRAPH software generates image maps on demand with the IMAGEMAP= option or with the IMAGEMAP macro.
import: to restore a SAS transport file to its original form (a SAS library, a SAS catalog, or a SAS data set) in the format that is appropriate for the host operating system. You use the CIMPORT procedure to import a SAS transport file that was created by the CPORT procedure.
include: in the graphics editor, to read in or link to a graph other than the one currently being edited.
independent variable: in SAS/GRAPH software, a variable whose value, in part, determines the value of a dependent (or response) variable. In a plot, an independent variable typically appears on the X (or horizontal) axis.
interactive graph: SAS/GRAPH output that features user controls such as menus, buttons, and pictures that a user can manipulate. The controls are driven by a Java applet or an ActiveX control.
interpolate: to estimate values that are between two or more known values.
Joint Photographic Experts Group: a file format that is used for storing noninteractive images. If you generate a chart or graph in JPEG format, you cannot subsequently change its appearance. This format is best suited to complex graphics that have many colors, because it supports 16 million colors. Short form: JPEG.
JPEG: See Joint Photographic Experts Group.
justify: to position text in relation to the left or right margin or the center of the line.
key map: a SAS catalog entry used to translate the codes generated by the keys on a keyboard into their corresponding SAS/GRAPH internal character encoding. See also device map.
label: (1) descriptive text associated with a variable. By default, this text is the name of a variable or of a label previously assigned with the LABEL= option. (2) in special cases of pie charts and star charts in the GCHART procedure, the label is the midpoint value and the value of the chart statistics for a slice or spine.
latitude: used with maps, the angular measure between the equator and the circle of parallel on which a point lies.
legend: a visual key to graphic elements in a graph. The legend consists of the legend value, the legend value description, the legend label, and the legend frame.
link to: in the graphics editor, to include one graph into another by placing a template of that graph in the current graph. The template acts as a placeholder and can be resized; it creates a connection between the graph being edited and the linked-to graph such that any changes made to the linked-to graph are reflected in the graph where a template is placed.
longitude: used with maps, the angular measure between the reference meridian and the plane intersecting both poles and a point. The reference meridian, called the prime meridian, is assigned a longitude of 0, and other longitude values are measured from there in appropriate angular units (degrees or radians, for example).
major axis: in the graphics editor, the longest axis of a graphics object.
major tick marks: the points on an axis that mark the major divisions of the axis scale. See also minor tick marks.
map: a graphic representation of an area. The area is often a geographic area, but it can also be any other area of any size. See also device map and key map.
map area: a polygon or group of polygons on a map. For example, states, provinces, and countries are typical map areas. In a map data set, a map area consists of all the observations that have the same values for the identification variable or variables. A map area is sometimes referred to as a unit area. See also identification variable.
map data set: a SAS data set that contains information that the GMAP procedure uses to draw a map. Each observation in the data set contains variables whose values are the x, y coordinates of a point on the boundary of a map area. In addition, each observation contains an identification variable whose value identifies the map area that the point belongs to.
mapping: in the GMAP procedure, the process of displaying data values on a map.
marker: a symbol such as a dot, a cross, or a diamond, that is used to indicate the location of a data point on a plot or graph.
meridian: an imaginary circle of constant longitude around the surface of the earth perpendicular to the equator. See also parallel.
metafile: a file, produced by the Metagraphics facility internal driver, that contains device-independent graphics commands in a special format. A user-written external driver routine is required to read and process the metafile.
Metagraphics driver: a type of SAS/GRAPH device driver that can be written by users. A Metagraphics driver consists of an internal driver (supplied with SAS/GRAPH software), which writes a metafile in a special format, and an external driver (written by the user), which decodes the metafile and writes device-specific commands.
midpoint: a value that represents the middle of a range of data values.
minor axis: in the graphics editor, the shortest axis of a graphics object.
minor tick marks: the divisions of an axis scale that fall between major tick marks. See also major tick marks.
needle plot: a plot in which data points are connected by a vertical line which connects to a horizontal baseline. The baseline intersects the 0 value, or the minimum value on the vertical axis.
node: a connection point between two or more links. In a node-line graph, nodes are typically represented as a box and enable you to access information and possibly to traverse the graph by drilling up or down in the structure.
offset: the distance between a graphics object's original position and its new position when it is moved. Offsets can be specified for legends, axes, an entire graph, or other graphics object.
origin: in a three-dimensional graph, the point at which the X, Y, and Z axes intersect. In a two-dimensional graph, the point at which the X and Y axes intersect.
panel: in the GREPLAY procedure, a part of the template in which one or more pictures can be displayed. A template can contain one or more panels.
parallel: an imaginary circle of constant latitude around the surface of the earth parallel to the equator. See also meridian.
pattern type: in SAS/GRAPH software, the set of fill patterns that are valid for a particular type of graph. The PATTERN statement supports three pattern types: bar and block patterns, map and plot patterns, and pie and star patterns. See also fill pattern.
pie chart: a circular chart that is divided into slices by radial lines. Each slice represents the relative contribution of each part to the whole.
pixel: an element of an electronic image. A pixel is the smallest element on a display that can be assigned a separate color.
plot: a graph in which graphics elements such as markers or lines represent a view of the data. See also coordinates.
plot line: the line joining the data points in a plot.
plotter: a class of graphics devices that typically use pens to draw hard-copy output.
PNG: See Portable Network Graphic.
polygon font: a SAS/GRAPH font in which the characters are drawn with enclosed areas that can be either filled or empty. See also stroked font.
polyline: in SAS/GRAPH software, a graphics object composed of connected line segments that might have attributes. A polyline is not a closed object; therefore, it cannot be filled with a pattern.
Portable Network Graphic: a file format that returns the graphical output in separate files and that produces a static image. This format is similar to the GIF format, but has additional features, such as support for true-color images and better compression. Short form: PNG.
PostScript: a device-independent page description language for printing high-resolution integrated text and graphics.
prism map: a three-dimensional map that uses prisms (polyhedrons with two parallel surfaces) of varying height to indicate the ordinal magnitude of a response variable.
procedure output area: the portion of the graphics output area where the output from a graphics procedure is displayed. See also graphics output area and data area.
projection: in SAS/GRAPH software, a two-dimensional map representation of unit areas on the surface of a sphere (for example, geographic regions on the surface of the Earth).
prompt character: a character sent by the host computer to a device to signal that the host has finished transmitting data and is ready for a response from the device.
protocol: a set of rules that govern data communications between computers and peripheral devices.
radar chart: a chart that shows the relative frequency of data measures with statistics displayed along spokes that radiate from the center of the chart. The charts are often stacked on top of one another with circular reference lines, thus giving them the look of a radar screen. See also star chart.
rasterizer: a device that accepts commands (such as moves and draws) as input and that converts those commands into a bit-map. Rasterizers are connected between host computers and graphics output devices that require bitmapped input.
region: in the graphics editor, an area in the GRAPH window containing more than one graphics objects.
regression analysis: an analysis that models a dependent (or response) variable as a function of one or more independent (or predictor) variables. The regression line, which is the set of predictions from the model, appears as a line or curve in a plot of the dependent variable against an independent variable.
relative coordinate: a coordinate that is measured from a point other than the origin. In the Annotate facility, this point is usually the endpoint of the last graphics element that was drawn. See also absolute coordinate.
replay: in SAS/GRAPH software, to display graphics output that is stored in a catalog entry using the GREPLAY procedure.
response data set: a SAS data set used by the GMAP procedure that contains data values associated with map areas and one or more identification variables. See also identification variable, response values, and response variable.
response levels: the individual values or ranges of values into which the GMAP or GCHART procedure divides the response variable. See also midpoint.
response values: values of a response variable that the GMAP procedure represents on a map as different pattern/color combinations, or as raised map areas (prisms), spikes, or blocks of different heights. The GCHART procedure represents response values as bars, slices, spines, or blocks. See also midpoint.
response variable: (1)in the GMAP procedure, a variable in the response data set that contains data values that are associated with a map area. (2) In the GCHART, GBARLINE, and GCONTOUR procedures, a variable whose value is determined by the value of another variable or by the values of a set of variables. See also chart variable, response data set, response levels, and response values.
RGB: a color-coding scheme that specifies a color in terms of amounts of red, green, and blue components. See also HLS.
SAS/GRAPH font: a font stored in the SASHELP.FONTS catalog, and a font created by the user and stored in a GFONTn catalog. These fonts can be used only by SAS/GRAPH procedures or other procedures that generate GRSEG catalog entries. Examples of SAS/GRAPH fonts include Swiss, Simulate, and Marker. These fonts are provided for specialized purposes only.
scatter plot: a two- or three-dimensional plot that shows the joint variation of two (or three) variables from a group of observations. The coordinates of each point in the plot correspond to the data values for a single observation.
segment: in the GMAP procedure, a polygon that is a part of a unit area consisting of more than one polygon. For example, the representation of the state of Hawaii is a single unit area which consists of a group of individual segments representing the islands, each of which is a separate polygon. In the GFONT procedure, a segment is a single continuous line that forms part of all of a character or symbol. In the DATA Step Graphics Interface (DSGI), a segment is one or more graphics primitives that can be manipulated as a unit.
select: in the graphics editor, to choose an action or a graphics object. Once a graphics object has been selected, it can be copied, deleted, or otherwise manipulated.
snap: in the graphics editor, to automatically place graphics objects in the grid display area with precision.
software handshaking: a method of data flow control in which a device and a computer exchange predefined sequences of characters to indicate when data should be transmitted between the two. See also handshaking and hardware (or hardwire) handshaking.
spine: a line on a star chart used to represent the relative value of the chart statistic for a midpoint. Spines are drawn outward from the center of the chart.
spline: in SAS/GRAPH software, a method of interpolation in which a smooth line or surface connects data points.
spokes: lines that radiate from the center of a radar or star chart. These lines represent statistical information.
standard deviation: a statistical measure of the variability of a group of data values. This measure, which is the most widely used measure of the dispersion of a frequency distribution, is equal to the square root of the variance.
star chart: a chart that shows the values of chart statistics as either spines of varying lengths or slices of varying sizes. Star charts display statistics in a circle surrounding the spines or slices. See radar chart.
static graph: SAS/GRAPH output in the form of an image.
stroked font: in SAS/GRAPH software, a font in which the characters are drawn with discrete line segments or circular arcs. See also polygon font.
style attribute: A visual property such as color, font properties, and line characteristics that have reserved names and values defined in ODS. Style attributes are collectively referenced by a style element.
subgroup variable: the variable in the input data set for a chart that is used to proportionally fill areas of the bars or blocks on a bar chart, or to identify separate rings of a pie chart.
summary variable: a variable in an input data set whose values some SAS/GRAPH procedures total or average to produce the sum or mean statistics, respectively.
surface map: a three-dimensional map that uses spikes of varying heights to indicate levels of relative magnitude.
surface plot: a three-dimensional graph that displays a grid-like surface formed by the values of the vertical (Z) variable plotted on a plane specified by the X and Y variables.
system font: a font that can be used by any SAS procedure and by other software, such as Microsoft Word. These fonts include TrueType and Type1 fonts. Examples of system fonts include Albany AMT, Monotype Sorts, and Arial. Some system fonts, such as Helvetica, can also be present as device-resident fonts. System fonts generally provide the highest quality output.
template: (1) in the GRSEG graphics editor, a representation of a graph being linked to; a template is considered a single graphics object. (2) in the GREPLAY procedure, a framework that enables you to display one or more pictures on a page. (3) in ODS graphics (template-based graphics), a description of how output should appear when it is formatted.
templated graph: (1) in the GRSEG graphics editor, the graph to which a template links. (2) in the GREPLAY procedure, graphics output that is created by replaying one or more catalog entries of type GRSEG (graphics output) into panels in a template.
thumbnail: a small image that can be selected in order to display a larger image.
TIFF: Tagged Image File Format. An industry-standard file format for storing compressed images. The Tagged Image File Format specifies compression routines and file formats for a variety of image types, including bilevel, grayscale, and color.
tile chart: a graph that represents the relative values of data by using rectangular areas. The color of each area represents the value of one measure in the query. The size of each area represents the value of the another measure in the query. The academic term for a tile chart is 'treemap.'
tilt angle: the measure in degrees from the horizontal axis to the major axis of an object.
tool palette: in the graphics editor, the collection of icons that represent functions in the interface.
traditional map data set: a map data set that defines the boundaries of map areas by using X and Y coordinates. Each observation contains an identification variable whose value identifies the map area for that point. See also identification variable, map area, map data set, and spatial map data set.
transformation: in the DATA Step Graphics Interface (DSGI), a mapping of the window coordinates to the viewport coordinates.
translate: to change the location of a graphics object.
type style: a typeface design and its variations (for example, Swiss, Swiss Bold, and Swiss Italic). See also font.
unit: a single quantity of measuremen. In SAS/GRAPH software, units can have one of the following scales assigned: centimeters, percentages, points, inches, or cells.
unit area: See map area.
user-definable colors: the colors that can be defined using SAS color names, RGB (red, green, blue), HLS (hue, lightness, saturation), or gray-scale color equivalents.
viewport: in the DATA Step Graphics Interface (DSGI), a section of the display into which you place graphics elements or graphics output.
Web server: a server machine and software that enable organizations to share information through intranets and through the Internet.
window: in the DATA Step Graphics Interface (DSGI), a coordinate system that is used with a viewport and that can be defined by the user.
XON/XOFF handshaking: a method of data flow control in which the flow of data between a computer and a device is regulated by the transmission of XON (DC1) and XOFF (DC3) control characters between the device and the computer.

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