If you have one of those "remote entry" devices for your Garage or car on your keychain, then most likely there have been two questions floating in the back of your head since you first used it:

 * What the heck does this thing do when I push the buttons? How does it unlock the door from 20 feet away?
 
* How secure is it? Can I open someone else's garage door or car with it, or can other people get into my garage or car with theirs?

 In this article, you'll learn exactly how one of these little devices lets you get in and out of your home or vehicle securely -- while the older remotes are ok, the hopping codes used in modern remote-entry systems are extremely sophisticated and secure !

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