couldnt you just make your own message box?
make a form with the same controls as a messagebox and then make an exe out of it. then just call it with a second program and keep calling it for however many you want to put up there
this way they run on their own and do not wait for a response since they are different processes.

i would warn you that doing this kind of thing for alot of forms eats up memory but so would it any other way.