Shell_TrayWnd in Explorer.exe

    WM_USER + 12
        http://www.swissdelphicenter.ch/torry/showcode.php?id=2448

    WM_USER + 206
        http://forums.microsoft.com/MSDN/ShowPost.aspx?siteid=1&PostID=966033

    WM_USER + 237
        http://forums.microsoft.com/MSDN/ShowPost.aspx?siteid=1&PostID=966033

    WM_USER + 336
        http://www.codeproject.com/KB/miscctrl/Taskbar_Manipulation.aspx

    WM_USER + 377
        http://www.codeproject.com/KB/miscctrl/Taskbar_Manipulation.aspx

    WM_USER + 385
        http://www.codeproject.com/KB/miscctrl/Taskbar_Manipulation.aspx

    LOTS others
        http://www.autohotkey.com/forum/viewtopic.php?p=49830#49830