Smart Key - Smart Menus

Smart Menus are an older in-buffer menu system that worked on dumb terminals and pre-dated Emacs’ own dumb terminal menu support. They are included with InfoDock (which is no longer maintained) and are not available separately. They are not a part of Hyperbole and are not necessary for its use.

When pressed on a Smart Menu item (this is an older in-buffer menu
  system that pre-dates Emacs’ own menus):
  ACTION KEY
    Activates the item.
  ASSIST KEY
    Displays help for the item.

If the Smart Menu package (part of InfoDock) has been loaded and
‘hkey-always-display-menu’ is non-nil:
  ACTION KEY or ASSIST KEY
     Pops up a window with a Smart Menu of commands.
     The menu displayed is selected by (smart-menu-choose-menu).