You are at home late one night, upgrading some software on your wireless LAN. There is no one else in the house, and the neighbour's driveway is empty.

You reboot your laptop and wait for it to come back to life. Suddenly the light on your wireless log begins flashing wildly with your laptop rebooting. There shouldn't be any traffic to register, yet it's blinking like Andromeda.

The laptop finally reboots and the green fields of XP grace your screen. The log light continues to sparkle, but the little monitors showing network activity from your laptop are blank.

Someone, somewhere close by, is hacking into your wireless LAN, but it might not be malicious. In fact, the perpetrator may be totally unaware he or she has invaded your system.

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