Flash Player 9. The first IDE to export to FP9 was CS3. But you don't need Flash to use ActionScript. You can use the open-source IDE FlashDevelop. It is hugely popular, and totally free. You will also need to get the free Adobe Flex SDK to compile to SWFs, but the install page of FlashDevelop's website gives details on everything you need, and current versions of FlashDevelop will even ask if you want it to get the SDK automatically for you.

What version of flash uses Actionscript 3?
I have a Microsoft Comfort Curve keyboard (KU-0459). It features a set of buttons for volume control. The interesting one is "mute".

I also have a set of USB speakers (Logitech S-150), and a set of headphones with the usual 3.5 mm green/pink jacks going to my on-board sound card.

I am on Windows 7 Ultimate.

I am able to selectively mute the speakers by going into Control Panel -> Sounds -> Playback tab -> Right click speakers -> Disable. I'm very lazy, and I want all of this "clicking" to be done automatically whenever I press my Keyboard's mute button.

If your answer is "AutoHotkey", it would be very nice if you could supply the .ahk script itself
