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Security Features of Double Glazed Windows Contrary to old wooden frames modern double-glazed windows come with security features to make it difficult for burglars to gain access to windows. They have high-end handles and robust locking mechanisms. Espag handles come with an auxiliary spindle in the back of the handle that controls the multi-point lock within the window frame. They are extremely popular on uPVC windows. They come in cranked and straight versions. High-Tech Locking Mechanisms Window locks