A Z stage is placed on an XY stage in avoidance of an area to which a mark table is fixed. At least one glass substrate of the window is ion beam treated andor milled prior to application of a coating over the treatedmilled substrate surface andor prior to heat treatment. The flexible cover is selectively removable from the side wall to allow access to an interior of the trough member. An end attachment element can also be coupled to the screen wherein this attachment element can be designed to either stand up in a window to allow attachment to the lock or catch on the window or to lay flat to allow for inactivity and detachment of the screen from the window.