AMOSi:Autoback
an example can be found on AMOSPro_Tutorial:Tutorials/Autoback_&_Update.AMOS
Sets the automatic screen copying mode used by double buffered screens.
Mode number 0 sends all graphics to the logical screen.
Mode 1 performs each graphical operation to both the physical and logical screens.
Mode 2 (default) combines all drawing operations with the Bob updates.
Autoback modenumber