public static extern bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, ref Win32.POINT pptDst, ref Win32.SIZE psize, IntPtr hdcSrc, ref Win32.POINT pprSrc, int crKey, ref Win32.BLENDFUNCTION pblend, int dwFlags)

Public Shared Function UpdateLayeredWindow(hwnd As IntPtr, hdcDst As IntPtr, ByRef pptDst As Win32.POINT, ByRef psize As Win32.SIZE, hdcSrc As IntPtr, ByRef pprSrc As Win32.POINT, crKey As Integer, ByRef pblend As Win32.BLENDFUNCTION, dwFlags As Integer) As Boolean