Abstract: A latching mechanism is provided for use with a cabinet having a number of drawers in stacked relation, to permit the opening of only one drawer at a time. The mechanism is suited for retroactive fitting to existing cabinets, and for original equipment manufacture. The mechanism components are mounted on the drawer slide, the active components being secured by way of a bracket to the stationary channel member of the slide, and an actuating pin for cooperation therewith secured to a movable drawer slide. A lock and locking systems components also may be provided. A method of constructing an anti-tip locking mechanism is also provided.