Apogee Enterprises is a leader in architectural products and services, providing architectural glass, aluminum framing systems and installation services for buildings, and value-added glass and acrylic for custom picture framing and displays. Its markets include the U.S. government, offices, education, health care and hotels. It operates under 4 segments. The Architectural Glass segment & The Architectural Services segment are involved in designing, engineering, fabricating and installing walls and windows of glass constituting the outside skin of commercial and institutional buildings. Its key products are Viracon & Harmon. The Architectural Framing Systems designs, engineers and finishes the aluminium frames for window, curtainwall, storefront and entrance systems with features like energy efficiency and hurricane protection. The segment comprises Wausau Window and Wall Systems, Tubelite and Linetec. The Large-Scale Optical segment manufactures value-added glass and acrylic products.