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Group Image Nodes allow you to organize the nodes comprising your textures into units that are easy to understand, edit, and reuse. Most importantly, the nodes found in this section allow the output of a single node to be used in multiple locations, as explained in the tutorial Extending the Library.
Group and Reference nodes are unique in that you don't need to create
them directly. Dragging additional output wires from the bump at the base of
existing nodes will automatically create all needed Group and References.
Page URL: http://www.spiralgraphics.biz/genetica/help/index.htm?grouping.htm