Like Tony, I'm not sure why you would share a scanner. But, I think the driver has to conform to the WIA (Windows Image Acquisition) spec. Only ME and XP support this. I may be talking out of my a$$, but I think WIA compliant devices show up in explorer like printers do in 98 and 2000. From there you may be able to right click and set sharing rights.
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-Rob Riccardelli
80GB 16MB MK2 090000736