i know there is a cat door you can get with a matching collar and the collar has a release for the cat flap
http://www.smarthome.com/6191c.html
its pricey but you might be able to find a cheaper version
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 No kind action ever stops with itself. One kind action leads to another. Good example is followed. A single act of kindness throws out roots in all directions, and the roots spring up and make new trees. The greatest work that kindness does to others is that it makes them kind themselves.
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