Starting to Build

I'm putting together the list of items to get to start working on a home cockpit. One question that comes to mind is:Can I use a network to have add-on scenery and what not to a few computers or must I buy for each computer? I'm looking at having about 7 computers for a couple different planes and not to sure if I need a server on how this works.Lets say I wanted to have a cessna set up and a twin setup and be able to fly them differently at the same time but share all the add-ons...is this possible? Is there a preformance hit? How would I do this if it is possible?Any links or help or words from the guru would be great.Kilstorm