- * If you are running XEmacs under the X Window System, a menu bar at
- the top of the frame makes shortcuts to several of the commands
- available (*note Pull-down Menus::).
+ * If you are running XEmacs under a graphical windowing system, a
+ menu bar at the top of the frame makes shortcuts to several of the
+ commands available (*note Pull-down Menus::).
+
+ * If you are running XEmacs under a graphical windowing system, a
+ toolbar at the top of the frame, just under the menu bar if it
+ exists, provides "one-touch" shortcuts to several commands. (Not
+ yet documented.)
+
+ * If you are running XEmacs under a graphical windowing system, a
+ gutter at the top (under the toolbar) and/or bottom of the frame
+ provides advanced GUI facilities like tab controls for rapid
+ switching among related windows and progress bars for
+ time-consuming operations like downloads across the Internet.
+ Gutters are an experimental feature introduced in XEmacs version
+ 21.2. (Not yet documented.)