Like the Windows Navigation pane, the Finder Sidebar sits at the left side of folder windows, providing hierarchical icons to navigate to other folders. In either, you can get to any folder on the computer. The Finder Sidebar debuted in Mac OS X 10.3 Panther, two years after the Navigation pane appeared in Windows XP. Microsoft did steal the triangles from Apple; before Vista, Windows used plus and minus signs to expand or collapse lists.
