the same way that you do it by windown, you need to install webx5 inside your mack book (you need 3rd party program in order to instal x5 program inside your macbook, since x5 is a windows base application)

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Good Luck
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Anthony is right - you will need to have Bootcamp or Parallels or one of the other programs available for the Mac to run Windows. Apparently it works well. Any users here on the forums who can comment?