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The Selected state is a special property of the Visible state (see section 3.1.2). Only objects that are Visible, Focused (see section 3.1.1), or alternatively Locked (see section 3.1.3) can be Selected. Much like the Marked state (see section 3.1.4), the Selected state is a indicator of interest and provides an input set to application functions. Unlike, the Marked state, the Selected state is more transient and is easily cleared. The act of selection is usually performed in either the 3D (see chapter 5) or 2D (see chapter 6) display. Selected objects are usually indicated by a change of color (the default is orange) in these displays. More details on the actual process of selection can be found in the 3D and 2D display chapters.
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