Vik,
I have inquired about this myself...the answer seems to be that if you are using OS9.x and MacPlot Pro you will have to upgrade to the latest version of MacPlot Raste to plot a carbon application (VW 9.5 and up. If you are using OS10x you will need the Microspot X-rip driver.
There is a discount cost for upgrades and using VW, but the discount is not much.
HTH,
Fred