The multifunctional corner is used in window sashes of all possible sizes. Thanks to it, opening, tilting and closing the windows is very easy. This is because the movement of the sash is suppressed at an early stage, and its simultaneous lifting ensures easy insertion of the sash into the frame. The main elements of the corner are a tilt catch, locking with mushroom cams, sash lift, and locking of improper sash operation.