XCirculateSubwindows(display, w, direction)
      Display *display;
      Window w;
      int direction;
| display | Specifies the connection to the X server. | 
| w | Specifies the window. | 
| direction | Specifies the direction (up or down) that you want to circulate the window. You can pass RaiseLowest or LowerHighest. | 
XCirculateSubwindows() can generate BadValue and BadWindow errors.
| BadValue | Some numeric value falls outside the range of values accepted by the request. Unless a specific range is specified for an argument, the full range defined by the argument's type is accepted. Any argument defined as a set of alternatives can generate this error. | 
| BadWindow | A value for a Window argument does not name a defined Window. |