Streamlined and Intuitive - The SmartTouch window lock mechanism is incorporated into the window sash for a sleek, low-profile design. It operates effortlessly. One smooth, single motion opens or closes the window, and locks it. No pinching, squeezing or twisting.The locks engage when the window is closed when you have one of Milgard's self latching windows (Tuscany, Trinsic, Style Line). The Tuscany and Trinsic locks offer a visual indicator that when the window is closed, it is also locked. The SmartTouch lock offered on Tuscany windows is unlike most locking mechanisms available today as it requires no squeezing or twisting to operate, making it ideal in universal design.