some people configure their laptops to automatically connect to a wireless network. it wouldn't be hard to run a router of a 9 volt battery, manage it from your own laptop, and see when a laptop connects. However, this would only work with laptops are on, and you'd end up with a lot of connections from laptops outside cars as well. Another idea, LOOK IN THE WINDOW!
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some people configure their laptops to automatically connect to a wireless network. it wouldn't be hard to run a router of a 9 volt battery, manage it from your own laptop, and see when a laptop connects.
However, this would only work with laptops are on, and you'd end up with a lot of connections from laptops outside cars as well.
Another idea, LOOK IN THE WINDOW!