Library /sys$common/syshlp/dce$cdsbrowser.hlb Overview, view, ch_display  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The Browser provides two basic formats for displaying
  the namespace: outline and tree. Outline format uses
  indenting to show the hierarchy of entries in the
  namespace. Lines connect the entries when the display
  is in tree format.

  To change the format, you can toggle between Display
  Tree or Display Outline from the View menu.