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Anne Ravenel wrote: "Because of PD, I am unable to use a mouse but have had success using a track ball." I find my Kensington Turbomouse (which has a large ball and is programmable via selecting settings, et cetera is often easier to use. I do not have the exaggerated tremor, however. ron 1936, dz PD 1984 Ronald F. Vetter <[log in to unmask]> http://www1.ridgecrest.ca.us/~rfvetter/