Lots of them about.
My ADSL is shared by two computers via wireless adapters (a PCMCIA card for the lappy , and a USB gadget for the desktop) , you can't access it without logging in.
Secured.
My wireless devices can talk with the modem , plugged into the phone line, across the length of my house. So presumeable if you drive past my house you'll see there is a wireless router/modem there , but you can't get in (unless you can crack the encyption).
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