tactile displays and tooltips

One of the most useful ways to provide support for graphics is through
tactile displays. Does anyone know how tactile displays "show" tooltips?

                                                              
                                                              
                    Regards,                     Fred         
                                                              
                   Fred Esch                                  
       Accessibility, Watson Innovations                      
    AARB Complex Visualization Working Group                  
                     Chair                                    
        W3C SVG Accessibility Task Force                      
                   IBM Watson                                 
                                                              
                                                              

Received on Tuesday, 19 May 2015 15:09:26 UTC