Tactile and force feedback device

A system comprising a main body part executing an application program and a user interface program and a control device mounted in separation from said main body part and adapted for controlling the state of said application program;

• said control device including an interfacing element acted on by a user;
• a piezo actuator arranged on said interfacing element for presenting tactile feedback to a user acting on said interfacing element;
• and
• a controller for driving controlling said piezo actuator;
• said piezo actuator being of a circular-shaped multi-layered structure and having a shape changed to an upturned dome shape or to a downturned dome shape on application of voltages of opposite polarities to a plurality of layers in an upper portion of said multi-layered structure and to a plurality of layers in a lower portion of said multi-layered structure;
• said controller controlling the change between the upturned dome shape and the downturned dome shape by a signal;
• such control by said controller being managed in keeping with the current state of said application program and the interface program.