[James]

I don't belive Jim you have to do anything on your end except enable people to scale the window edge wider until it extends over two monitors. Or more likely just double the X. So if they're at 1280x1024, to do doublescreen you'd open a 2560x1024 window and the OS takes care of which pixel goes to which screen for you.

indeed.......thats' why I said just set the wdith of SSA fixed
Jim, is that possible?
lock the camera panning and with fixed width so that the dirver can extend the rest part of the SSA to other screen??