Brian,

Screen resolution can be set using API call ChangeDisplaySettings, which changes the settings of the default display device to the specified graphics mode.

DECLARE INTEGER ChangeDisplaySettings IN user32; 
    STRING @lpDevMode,; 
    INTEGER dwflags

The first input parameter points to a DEVMODE structure, which makes this function rather difficult to be called under Visual FoxPro. Still it is possible.

There's a sample code (members area) on my web site:
How to change display settings: screen resolution, screen refresh rate
http://www.news2news.com/vfp/?example=374

True, this subject brings a discussion almost every time, whether one should adjust screen resolution or not.