Download Kensington TrackballWorks software to customise the functions of each of the buttons found on this Kensington trackball. The result is a more productive and truly personalized computing experience. Set your preferred functions or keyboard shortcuts for each trackball button or combination of buttons, adjust the pointer speed and acceleration and do so much more. Best of all, by allowing you to personalise your trackball experience, TrackballWorks makes your trackball work the way you do. TrackballWorks is compatible with the latest operating system versions including Windows 7, Windows Vista , Windows XP and Mac OS.