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GKS is a standard specifying the input and output primitives for displaying
2D and 3D graphical data. Although GKS has no native file format, the CGM
(Computer Graphics Metafile) format is often closely associated with its use.

The following ISO documents describe the GKS standard:

  ISO 7942    Functional Specification
  ISO 8651-1  Fortran Binding
  ISO 8651-2  Pascal Binding
  ISO 8651-3  Ada Binding
  ISO 8651-4  
  ISO 8805    GKS-3D
  ISO 8806    GKS-3D Bindings

These documents are available from ISO, ANSI, and CSA (see the CGM section
for the addresses of these organizations).