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Security Features of Double Glazed Windows Unlike old wooden frames, modern double-glazed windows come with security features that make it difficult for burglars to open the windows. These include robust locking mechanisms and top-quality handles. have spindles on their back that triggers a multi-point lock that is attached to the window frame. They are popular on modern uPVC windows and are available in cranked or straight variations. High-Tech Locking Mechanisms Window locks a