Im not sure what your getting at but it sounds like you need the display commands.
DISPLAY
PERFORM CHECKLIST FOR GRAPHICS CARDS : PERFORM CHECKLIST FOR GRAPHICS CARDS
PERFORM CHECKLIST FOR DISPLAY MODES : PERFORM CHECKLIST FOR DISPLAY MODES
SET DISPLAY MODE : SET DISPLAY MODE Width, Height, Depth
SET GRAPHICS CARD : SET GRAPHICS CARD Cardname
SET GAMMA : SET GAMMA Red, Green, Blue
SHOW WINDOW : SHOW WINDOW
HIDE WINDOW : HIDE WINDOW
MAXIMIZE WINDOW : MAXIMIZE WINDOW
MINIMIZE WINDOW : MINIMIZE WINDOW
RESTORE WINDOW : RESTORE WINDOW
SET WINDOW ON : SET WINDOW ON
SET WINDOW OFF : SET WINDOW OFF
SET WINDOW SIZE : SET WINDOW SIZE Width, Height
SET WINDOW TITLE : SET WINDOW TITLE Caption String
SET WINDOW LAYOUT : SET WINDOW LAYOUT Style, Caption, Icon Number
SET WINDOW POSITION : SET WINDOW POSITION X, Y
LOCK BACKBUFFER : LOCK BACKBUFFER
UNLOCK BACKBUFFER : UNLOCK BACKBUFFER
SCREEN TYPE : Return Integer=SCREEN TYPE()
SCREEN WIDTH : Return Integer=SCREEN WIDTH()
SCREEN HEIGHT : Return Integer=SCREEN HEIGHT()
SCREEN DEPTH : Return Integer=SCREEN DEPTH()
SCREEN INVALID : Return Integer=SCREEN INVALID()
SCREEN FPS : Return Integer=SCREEN FPS()
CURRENT GRAPHICS CARD$ : Return String=CURRENT GRAPHICS CARD$()
CHECK DISPLAY MODE : Return Integer=CHECK DISPLAY MODE(Width, Height, Depth)
GET BACKBUFFER PTR : Return Integer=GET BACKBUFFER PTR()
GET BACKBUFFER WIDTH : Return Integer=GET BACKBUFFER WIDTH()
GET BACKBUFFER HEIGHT : Return Integer=GET BACKBUFFER HEIGHT()
GET BACKBUFFER DEPTH : Return Integer=GET BACKBUFFER DEPTH()
GET BACKBUFFER PITCH : Return Integer=GET BACKBUFFER PITCH()
