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The ObjectViewer plug-in displays an icon list of all objects in the Rhino file. Each object is organized by layer or group in a heirarchial tree that displays nested groups and layers.
Individual objects within a group can be selected within the ObjectViewer window (even if the object is currently locked or hidden). The selected object can then be hidden, locked, shown, or be used as input to Rhino commands. Objects can also be moved between groups or layers by drag-n-drop.
Selecting single objects is only supported at this time, but multiple object selection will be enabled in the future.