Frontend and backend communication

[Nick Sabalausky]

"Dainius (GreatEmerald)" <pastas4 at gmail.com> wrote in message 
news:mailman.1931.1311788506.14074.digitalmars-d-learn at puremagic.com...
> For example, now I have a function Shuffle() that calls
> PlaySound(SHUFFLE). Shuffle() is a backend function, while PlaySound()
> is a frontend one, so obviously it won't work that way after the
> split.

Why not?