Smart Key - Dired Mode

If pressed within a dired-mode (directory editor) buffer:
  ACTION KEY
     (1) within an entry line, the selected file/directory is displayed
         for editing, normally in another window but if an entry has been dragged
         for display in another window, then this entry is displayed in the current
         window (DisplayHere minor mode is shown in the mode-line; use {g} to
         disable it)
     (2) on a dired header line (other than the end of line):
         (a) within the leading whitespace, then if any deletes are to be
             performed, they are executed after user verification; otherwise,
             nothing is done;
         (b) otherwise, dired is run in another window on the ancestor directory
             of the current directory path up through the location of point; if
             point is on the first character, then the / root directory is used.
     (3) on or after the last line in the buffer, this dired invocation is quit.

  ASSIST KEY
     (1) on a ~ character, all backup files in the directory are marked for deletion;
     (2) on a # character, all auto-save files in the directory are marked for
         deletion;
     (3) anywhere else within an entry line, the current entry is marked for deletion;
     (4) on or after the last line in the buffer, all delete marks on all entries are
         undone.