Screen Structure, 40, 45, 54, 58, 82, 108, 235
  1.3 compatible usage, 19
  BarLayer, 40
  BitMap, 40
  BlockPen, 55
  DetailPen, 55
  Font, 41, 58, 215
  LayerInfo, 40
  LeftEdge, 40, 86
  MouseX, 40
  MouseY, 40
  RastPort, 40
  TopEdge, 40, 86
  UserData, 41
  ViewPort, 40, 64
  WBorBottom, 40, 89
  WBorLeft, 40, 89
  WBorRight, 40, 89
  WBorTop, 40, 89