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This looks to be a vendor specific question about the Brilliant Accounting product and its capabilities. You should get in touch with them and find out if their client/server model is routable and how much bandwidth each client will need. Multiply that bandwidth by the number of clients and find a VPN solution that will accommodate. If this isn't possible, you'll be looking at a telco provided solution between buildings.
Other option, with specialized equipment and line of sight between the buildings, Point to point wireless may work.
Brilliant Accounting, Enterprise software
currently using Brilliant Accounting package, opened another office about 30km from H/O - how do we go about in sharing same acc. package at same time 
