>I created a text file, put SCREEN = OFF in it, renamed it config.fpw, and saved it in the same directory as the exe file.
>in the main program, but when I run it, I can still see the window change

Put TITLE = My APP in the config file as well, and tell me if you see My APP in the caption bar when you come in. That will tell us its in the right spot.

Also, it could be that you are Maximizing and the Showing so quickly, that you can't tell difference?