Layers, 205, 703, 929
  accessing, 707, 711
  alternative to GimmeZeroZero, 93
  backdrop, 706
  blocking output, 711
  clipping rectangle list, 719
  creating, 710, 710
  creating the workspace, 709
  damage list, 97
  deleting, 710
  introduction, 703
  moving, 711
  opening, 706
  order, 711
  redrawing, 711
  requester, 204
  scrolling, 711
  sizing, 711
  sub-layer operations, 712
  updating, 711
  windows, 170
  with screens, 65