Randy,
Thanks for your interest in NetLogo.
In NetLogo 6.3, you can just provide the model path as the first argument, no switches required (make sure to use double quotes if there are spaces):
./NetLogo "./models/Code Examples/Many Regions Example.nlogo"
In Windows it might be more like this:
NetLogo.exe "models\Code Examples\Many Regions Example.nlogo"
You do want to run the executable from the NetLogo install directory to get the working path set there, as NetLogo will assume certain paths for the models library and extensions (`cd "C:\Program FIles\NetLogo 6.3.0\"`, or whatever you've got it at).
Let me know if you still have trouble with it.
-Jeremy