Smart Key - Buffer Menus

If pressed within a listing of buffers (Buffer-menu-mode):
  ACTION KEY
     (1) on the first column of an entry, the selected buffer is marked
         for display;
     (2) on the second column of an entry, the selected buffer is marked
         for saving;
     (3) anywhere else within an entry line, all saves and deletes are
         done, and selected buffers are displayed, including the one
         just clicked on (if in the OO-Browser, only the selected buffer
         is displayed);
     (4) on or after the last line in the buffer, all saves and deletes
         are done.

  ASSIST KEY
     (1) on the first or second column of an entry, the selected buffer
         is unmarked for display and for saving or deletion;
     (2) anywhere else within an entry line, the selected buffer is
         marked for deletion;
     (3) on or after the last line in the buffer, all display, save, and
         delete marks on all entries are undone.

If pressed within an interactive buffer menu (ibuffer-mode):
  ACTION KEY
     (1) on the first or second column of an entry, the selected buffer is
         marked for display;
     (2) anywhere else within an entry line, all saves and deletes are done, and
         selected buffers are displayed, including the one just clicked on (if
         within the OO-Browser user interface, only the selected buffer is
         displayed);
     (3) on the first or last line in the buffer, all deletes are done.

  ASSIST KEY
     (1) on the first or second column of an entry, the selected buffer is unmarked
         for display or deletion; 
     (2) anywhere else within an entry line, the selected buffer is marked for
         deletion;
     (3) on the first or last line in the buffer, all display, save, and delete
         marks on all entries are undone.