Kensington MouseWorks contains the drivers for the Kensington Mouseball or Trackball. This version supports all Kensington USB and ADB mice and trackballs except: One-button mice Turbo Mouse 1.0-4.0 (the older, 2-button models) Orbit 3D and Orbit Elite ValuMouse products What's New: MouseWorks version 2.5.1 contains a minor change to fix an issue where some users were not having their Kensington ADB pointing devices detected. If you are using Mac OS X 10.3 Fast User Switching, you must use MouseWorks 2.4 or later, since earlier versions will get very confused. | 
