If you put (this example of) xturtle.cfg either into the directory where
xturtle.py resides or into the current working directory, the
configuration will be loaded. In this case window size and turtle are
configured to look like in module turtle.
If no config-file is found a standard configuration is used. (This
standard configuration currently uses a scrolled canvas but could of
course be changed to look like that furnished by the above cfg-file.)