I was just wondering, is it possible to make a dual screen with ags editor. I do know it has it's own on screen touch but how would making a dual screen script work?
What do you mean by that? Do you mean to use the editor with two screens, or to make a games that run in two screens?
I'm not sure about the former (may work and developing stuff with two screen could have some advantages) but it's definitely not possible in the later case (unless it's just one screen stretched across several monitors, which depends on the display drivers, I think).
I mean a dual screen, such as the one used in pokemon diamond
http://dl.poke-mega.org/wp-content/uploads/2009/09/pokemon_diamond_pearl_12.jpg
Then you're talking about the later. No, it's definitely not possible, unless what you mean is to do this on one display with the top and bottom parts displaying different things, then it is possible to some extend (like for example use a GUI to cover up half of the screen, or do it like what Vince XII did (http://xiigames.com/linus/)).
*Faking* dualscreens would be simple but highly impractical- you could overlay the (one) display you actually have with a GUI on wich the second display sits. Pokemon G/S/P used the touch screen mainly for button commands and displays, so yes, that *could* be done.
Waste of screen estate, though, since all PC screen resolutions are wider than high, and the DS is, well, higher than wide.