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I am using the expert trackball with excellant results, I have one of the four buttons programmed to middleclick. I think you can program R+ L buttons to a middle click also.
I don't believe the drivers supported newer versions of windows at the time I bought it about a year ago.SteveWF-2 M080 FlexCWin XP SP-2Dell PWS 690 3GB RamNvidia Quadro FX4600