in buffers to which you can return later. Unlike registers, bookmarks
persist between Emacs sessions.
+@item Border
+A border is a thin space along the edge of the frame, used just for
+spacing, not for displaying anything. An Emacs frame has an ordinary
+external border, outside of everything including the menu bar, plus an
+internal border that surrounds the text windows and their scroll bars
+and separates them from the menu bar and tool bar. You can customize
+both borders with options and resources (@pxref{Borders X}). Borders
+are not the same as fringes (q.v.@:).
+
@item Buffer
The buffer is the basic editing unit; one buffer corresponds to one text
being edited. You can have several buffers, but at any time you are