Yes, you can use any laptop to view the dashboard viewer (either IFI's or someone else's). Just as long as it's on batteries.
You'll want to check with the FIRST Q&A on this, but if I ruled the world, the dashboard viewer would be part of the control system--and thus shouldn't be touched by the coach.
For all of the juicy details, try
www.innovationfirst.com and look under the OI section.