If you are using all 2d graphics use either the LOAD BITMAP method Aura mentioned, or with LOAD IMAGE
LOAD IMAGE "back.bmp",1
PASTE IMAGE 1,0,0
If you are using 3d graphics use the LOAD BITMAP method that Aura mentioned but be sure to use DRAW TO BACK and to do that method once right after every SYNC. You could also use the LOAD IMAGE....TEXTURE BACKDROP METHOD, or use a textured plain positioned appropriately in front of the camera.
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