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ok you need one wireless router and as many wireless cards as you have compiuters. and yes you can secure your net work.
i know next to nothing about wireless but here is what i do know.
you can set the router to only accept connections from specific cards cards, ie it reads the MAC address of teh card and only allows comunicatiosn from that card. this will stop people from joining your network. but not from snoping. all the trafic is across the air so any one cna pic it up and 'watch what you are doing' they can reconstruct the webpages you are looking at, the files you transfer...
only when you encrpyt the data across the network are you secure.
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