Use multimedia key to start winamp

"You can use AutoHotKey to set those buttons up to whatever you want

Special Keys

If your keyboard or mouse has a key
not listed above, you might still be
able to make it a hotkey by using the
following steps (requires Windows
XP/2000/NT or later):


Ensure that at least one script is running that is using the keyboard
hook. You can tell if a script has
the keyboard hook by opening its main
window and selecting ""View->Key
history"" from the menu bar.
Double-click that script's tray icon to open its main window.
Press one of the ""mystery keys"" on your keyboard.
Select the menu item ""View->Key history""
Scroll down to the bottom of the page. Somewhere near the bottom are
the key-down and key-up events for
your key. NOTE: Some keys do not
generate events and thus will not be
visible here. If this is the case, you
cannot directly make that particular
key a hotkey because your keyboard
driver or hardware handles it at a
level too low for AutoHotkey to
access. For possible solutions, see
further below.
If your key is detectible, make a note of the 3-digit hexadecimal value
in the second column of the list (e.g.
159).
To define this key as a hotkey, follow this example:

SC159:: ; Replace 159 with your key's value.
MsgBox, %A_ThisHotKey% was pressed.
return


Reverse direction: To remap some other key to become a ""mystery key"",
follow this example:

; Replace 159 with the value discovered above. Replace FF (if


needed) with the
; key's virtual key, which can be discovered in the first column of the
Key History screen.
#c::Send {vkFFsc159}

Alternate solutions: If your key or mouse button is not detectible by
the Key History screen, one of the
following might help:

Reconfigure the software that came
with your mouse or keyboard (sometimes
accessible in the Control Panel or
Start Menu) to have the ""mystery key""
send some other keystroke. Such a
keystroke can then be defined as a
hotkey in a script. For example, if
you configure a mystery key to send
Control+F1, you can then indirectly
make that key as a hotkey by using
^F1:: in a script.

Try DllCall: Support for Human
Interface Devices. You can also try
searching the forum for a keyword like
RawInput*.

The following is a last resort and
generally should be attempted only in
desperation. This is because the
chance of success is low and it may
cause unwanted side-effects that are
difficult to undo:

Disable or remove any extra software
that came with your keyboard or mouse
or change its driver to a more
standard one such as the one built
into the OS. This assumes there is
such a driver for your particular
keyboard or mouse and that you can
live without the features provided by
its custom driver and software."