Some may of thought of this allready, but if not, this can be a good trick for making a different style fangame! Using two subapp objects and a main frame that holds two, you can have a Nintendo DS style double screened game! Both can be different frames, interacting via global values, as well as the lives and score value for player 1 to 4. This tiny crappy little demo simply shows a top and bottom frame(frames 2 and 3 in the game playing both at once) interacting. The subapp object is quite a cool object, actually! You can use it to make a separate popup menu, make a split screen game, or even run two games at once if you wanted to! I hope this is the right place to post this, I just wanted to point out this great object and a neat little trick you can do with it, and didn't know where else to post it.
Hold on a sec.... seems I can't post exes or zips, so I'll just have to let you trust me on this one/let you try to do it yourselves.