PERFORM CHECKLIST FOR DISPLAY MODES will list all display modes you can use
SET DISPLAY MODE will set the screen display mode provided it is available
The next commands will return a result:
CHECK DISPLAY MODE() will return a one if the display mode is available
SCREEN TYPE() will return the current screen type
SCREEN WIDTH() will return the current screen width
SCREEN HEIGHT() will return the current screen height
SCREEN DEPTH() will return the current screen depth
SCREEN FPS() will return the current frames per second