Split mode:
  CTRL-W h -- to the left window
  CTRL-W j -- to the bottom window
  CTRL-W l -- to the top window
  CTRL-W l -- to the right window

  CTRL-H H -- move window to left
  CTRL-H J -- move window to bottom
  CTRL-H K -- move window to top
  CTRL-H L -- move window to right