All it will do is open a screen and double buffer it. Actually the Blitzmax ptc may only be gdi drawing which means that you might not have such a smooth refresh rate as you want.
The one we use in freebasic was enhanced by rbraz to use gl instead of gdi drawing.
In the freebasic version you can use pre-processor instructions to select windowed or fullscreen.
Have a look in the includes for something says PTC_WIN and by commenting that, you may well get it to run full screen. I don't know as I don't even have a copy of Blitzmax.
Druggedbunny is not around here all that often so maybe better to mail him.
