From what you described, in order for you to print or view files, all 3 comps need to be on.
Most modern routers have built in USB ports and s/w that support file/print sharing. If it's hooked up to your router anyone on the same workgroup can access the printer/file 24/7. The router I use even has a web function (USB drive becomes a file server) it's like having your own webserver without any additional fees.
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