okey, i have tried win+shift+left/right, but it just puts on the top of the 2nd monitor the IE window from which the fullscreen image originated, it does not affect the fullscreen image that is still displayed only on the main screen.
I thought that this simple operation can move the overlay window to the right by the horizontal amount of pixels that corresponds to the actual resolution
unfortunately not, i am going to try a program now.
multimon, ultramon and dual monitors does not work, they only affect windows, my fullscreened app is an overlay-based activex control, and it is not affected by windows management. Do you know any way to manage overlay position i.e. registry change after the first window is maximized so the second one will maximize with the displacement according to the screen width.