Is it possible to attach a external hard drive to a network, so that 2 pc's can access it?

Answer 1

Yes it is possible with new product
http://www.nextgenelectronics.com/dlinkdsm604h.php

Or if you already have ext HDD need to look for converter

Answer 2

This is VERY common in industry.

Look up "Network Attached Storage" (NAS) in Yahoo or Google and you'll see how it works. Essentially you need to have a small processor and disk controller manage the network connection and disk access. But is it done.

Other ways to do it are to share the disks on computeres as a pee-to-peer network..Another way, but expensive is a storage area network (SAN)

Answer 3

yes, there's such a thing as NAS (network attached storage). Unfortunately that's as far as my knowledge goes. Google is your friend.