OK. I sometimes end up using the apple wired mighty mouse, from my iMac, on my macbook. My hands and fingers hurt when I use the trackpad on the macbook. I have the right click button to open/select, left button to open a new tab/window, side buttons to launch expose, and push of the scroll wheel to activate spaces. Will I be able to assign these the same way with the vx nano? I understand the nano has 5 buttons vs. 4 buttons for the apple mouse. And I read that I need to download something from the logitech website in order to use the nano and assign button functions to use on a mac. Correct? Any help is appreciated.