not sure what you mean by that. all apps run on the 1 system, you are just redirecting the gui to another section of screen,notice the screen size in disp props, mine comes up at 2048x1024 over 2 screens. this way i can work on my primary monitor and have browsers etc on another screen so i can forget alt-tab to use diff programs.
be aware though none of this works when you switch to d3d, very few games support a multi mon setup,and windows wont let you leave a working desktop on mon 2.
try
this for some more information on using more than 1 monitor