## Display Device Driver Reference for OS/2

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### Glossary - G

G

GDT - Global descriptor table.

Global Descriptor Table (GDT) - A table that defines code and data segments available to all tasks in an application.

glyph - A graphic symbol whose appearance conveys information; for example, the vertical and horizontal arrows on cursor keys that indicate the directions in which they control cursor movement, the sunburst symbol on the screen illumination control of a display device.

GPI - Graphics programming interface

graphic primitive - In computer graphics, a basic element, such as an arc or a line, that is not made up of smaller parts and that is used to create diagrams and pictures.

graphics attributes - The attributes that apply to graphics primitives. Examples are color selection, line type, and shading pattern definition. Contrast with segment attributes.

Graphics programming interface (GPI) - The formally-defined programming language that lies between an IBM graphics program and the user of the program.

graphics segment - A sequence of related graphic primitives and graphics attributes. See also graphic primitive.

GRE - Graphics engine.