static extern bool CloseDesktop(IntPtr hDesktop);

Shared Function CloseDesktop(ByVal hDesktop As IntPtr) As Boolean

    // ms-help://MS.VSCC.v80/MS.MSDN.v80/MS.WIN32COM.v10.en/dllproc/base/closedesktop.htm

    [DllImport("user32.dll", EntryPoint="CloseDesktop", CharSet =  CharSet.Unicode, SetLastError = true)]

    public static extern bool CloseDesktop(IntPtr handle);

    ' ms-help://MS.VSCC.v80/MS.MSDN.v80/MS.WIN32COM.v10.en/dllproc/base/closedesktop.htm

    <DllImport("user32.dll", EntryPoint:="CloseDesktop", CharSet:=CharSet.Unicode, SetLastError:=True)> _

    Public Shared Function CloseDesktop(ByVal handle As IntPtr) As <MarshalAs(UnmanagedType.Bool)> Boolean

        return WindowStationAndDesktop.CloseDesktop(handle);