Just using winamp as an example, WinKey can be used as part of a global hotkey, but I am not sure how they accomplished this. I guess I just got used to using Alt + Winkey for music player hotkeys, but I can change. I am sort of a hotkey junky and use most all system hotkeys and have a sort of self made logic that Ctrl + Alt are hotkeys for launching programs, Alt + Winkey is for media player hotkeys, and Shift + Ctrl or is used by default by too many programs and Winkey only is used by the system that I did not assign anything global to use these modifier keys.