right at the top of windows.txt:
-createconfig / -cc
Creates the default MAME.INI file. All the following configuration
options can be permanently changed by editing this configuration file.
-showconfig / -sc
Displays the current configuration settings. If you route this to a
file, you can use it as an INI file. For example, the command:
mame -showconfig >mame.ini
is equivalent to -createconfig.
