About the tutorial "Creating a Volume Control Slider"

I have read this tutorial it is great like other tutorials in kirupa. And I have got 2 questions about this tutorial.

1 - In this tutorial we let the user higher or lower the volume by sliding the dragger, but If I am to add to the right of the silder a button to higher the volume and to the left of the slider a button to lower the volume, which code do i need to add these buttons?

2- I have read the tutorial and applied it to a fla file named MC_VolumeControl.
And I load this MC_VolumeControl to my mainstage on another movie. Can I make this volume controller to control the movie which I load it into, Is it possible? Or somehow can I control the system’s sound?

Thanks for everything…