A phase change memory structure with multiple resistance states and methods of forming, programming, and sensing the same. Input specifying at least a portion of functionality of a system may be received, e. One side of the seat frame is pivotally attached to one of the side frame members. The slider linking part is provided on a front slider provided for openingclosing the front panel. The system also links the semiconductor processing nodes by a data connection means to allow microprocessors to load necessary parameter data or wafer lot numbers from corresponding semiconductor processing nodes by a data connection means.