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HP-GL (Hewlett-Packard Graphics Language) is a command language created to send vector graphics commands from a computer to pen plotters. The language was introduced in the mid-1970s for supporting HP's line of pen plotters and later became a standard for communicating with similar devices from other manufacturers. HP-GL commands are text-based and control the pen movement, drawing of lines and shapes, setting up the environment on the plotting surface, as well as some text labels. This simplicity made it easier for users to create technical drawings without having detailed knowledge of how the plotter worked internally. HP-GL was gradually superseded by formats such as PostScript and PDF that could handle both vector graphics and raster images but has nevertheless left an enduring impact on historical CAD/CAM applications.

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