i've post before about sending vertical games to one monitor and horizontal games to the other, i found a simple solution, if we use a mame with user interface (mameui32). on the left column we have games filters (all games, availble games,etc...) and we have vertical and horizontal games. right clck on vertical, chose properties, on screen tab chose wich display we want vertical games, a txt file is generate for vertical games. should be enough.