to control attributes of the window opened. The following attributes can be set:
| • | world-class specifies the class of world to construct. world is the default. |
| • | title is the window title. |
| • | status, if specified, is a gadget that will be used as the window's status bar. |
| • | gadgets is a sequence of gadgets that will be placed inside the window. |
| • | pixel-format-attributes is a sequence of Pixel format attributes that the window will request for its OpenGL pixel format. |
| • | window-controls is a sequence of Window controls that will be placed in the window. |