By now, you've visited websites that seemed to have a special message just for people in your home town, or near where you work.

The popular discount offer website Groupon uses this feature constantly. They are able to sense exactly where you are and they provide special offers to you based on the town or region you are in right now.

You might think they are spying on you, but in fact this is something we call IP Based Delivery. Every computer in the world is assigned a unique number when it connects to the internet. This number is called an IP address and it's like a phone number for your computer.

Every IP address is assigned to specific towns and your computer's IP address can be looked up in fractions of a second to determine where you are.

The basic IP Based Delivery wo...
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