code: void setTarget(
      GBSNode      targetNode,
      int          targetIndex,
      int          type)
    {
      _targetNode  = targetNode;
      _targetIndex = targetIndex;
      _type = type;
    }
docs: Remember the information about the target point.
  
  @param targetNode The node in which the target object resides.
  @param targetIndex
  The index within the node to the entry to
  be overlayed by the key in the delete point.
  @param type       Defines the manner in which the overlay is to be done.