EDT Sect
  Scrolls vertically a section at a time in the current direction---roughly
  75% of the window size.
  Steps:
     1.  To set the direction, use FORWARD (KP4) or REVERSE (KP5).
     2.  Press the EDT Sect key (KP8).
  Usage notes:
  o  If the cursor is free (which is the default), it moves up or down in
     the same column on the screen regardless of whether text is there or
     not.
  o  If the cursor is bound, it moves to the corresponding line positions,
     depending on the shape of your text, as in real EDT.
  o  For continuous movement, you can hold down or repeat KP8 until you
     reach the bottom or top of the buffer.
  Related topics:
     CHANGE DIRECTION    SET CURSOR BOUND    SET CURSOR FREE