If you're a Vista user, a feature called Network Discovery makes your PC visible on a network so that other users can see it and try to connect to it. On a private network, this is useful; at a public hot spot, it's a security risk. When you connect to a hot spot and designate the network as Public, Network Discovery is turned off, so again, make sure to designate any hot spot as Public.

However, you can also make sure that Network Discovery is turned off for your hot spot connection. When you're connected, choose ControlPanel-->View network status and tasks. Then in the Sharing and Discover section, click the Network Discovery button, choose "Turn off network discovery," and click Apply.

Encrypt your e-mail

When you send an e-mail at a hot spot, it goes out "in the clear" -- in other words, unencrypted -- so that anyone can read it. A lot of e-mail software allows you to encrypt outgoing messages and attachments. Check how to use yours, and then use it at a hot spot. In Outlook 2003, select Options from the Tools menu, click the Security tab, and then check the box next to "Encrypt contents and attachments for outgoing messages." Then click OK.

Carry an encrypted USB flash drive