Basic question: Variable output to scree

Thanks for the reply Perturbatio.Ahh that makes more sense.So I need to clear the buffer before I draw anything and always flip it afterwards ?

something like this ?
cls
DrawImage pacman,x,y,frame
Flip
Cls
DrawImage ko2sprite,x+50,y+10,frame
Flip
Cls
DrawText +x,100,100
flip