Hi all, With lots of thanks to weaponx who showed me, StructureConstants.au3 and realised that I had my DllCall mixed up and monoceres for showing me how to create a structure, I present to you AutoIt3 and Aero Glass! Komalo for the original DWMEnableBlurBehind and BrettF for another structure issue. Four functions: _Vista_ApplyGlass($hWnd) - Applies the glass effect to the whole GUI _Vista_ApplyGlassArea($hWnd, $Area) - Applies glass to an area (array) on the GUI _Vista_EnableBlurBe