I believe that with a wide open network, that it's possible to find and hack any computer that is on the network. This does assume some of the following, if the wireless network isn't secure, the pc's connected to the network don't have the latest security patches/firewall/up to date antivirus/etc. If someone wanted to be evil, they could either plant a trojan to get any private info on the pc, or use it as a "zombie" machine for spamming/spreading viruses/etc.
I don't think that most people would do more then leech internet access tho, but sometimes it's good to know what an evil person could do/try to do.
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