Windows are either operable (they can be opened) or fixed (they can’t be opened). There’s at least one sash — a sheet of glass and a framework of vertical stiles and horizontal rails — in a window. A pane is a single sheet of glass framed in a window. Glazing can refer to either the glass in a window or the process of securing the glass into the framework. The window frame consists of the head, jamb, side jamb and sill. Keep your home updated and energy efficient with Windows Replacement. With advanced technology, you can optimize your heat transfer and noise reduction while upgrading the quality of your window's durability. You will have an assortment of design options and brands to choose from.