NetStumbler is a tool for Windows that looks for wireless Internet connection networks. If you travel frequently and need to be connected to the Internet and you don't have a data connection that you can take anywhere, you will need to connect to the different wifi networks that you find along the way.
This program allows you to search for the networks that are within reach of your computer, it will tell you which of them is the one that provides you with the best coverage and it will first select those that are not protected by a password.
It's a free program that will help you stay connected while you travel.
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