XSetIconName(display, w, icon_name)
      Display *display;
      Window w;
      char *icon_name;
| display | Specifies the connection to the X server. | 
| w | Specifies the window. | 
| icon_name | Specifies the icon name, which should be a null-terminated string. | 
| BadAlloc | The server failed to allocate the requested source or server memory. | 
| BadWindow | A value for a Window argument does not name a defined Window. |