a LAN is a Local Area Network: which only has a limited range, and i would guess only your immediate neighbours are able to access it.
Simply use your router manual to find the address to connect to then you can look for the WEP key section, by adding this key it helps protect your wireless connection.
Any computer connecting wirelessly will have to update it's settings to include this key, but since you know what it is.. it is not that much work.
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