What does the option button on the 2002 honda civic do?

I bought my Honda Civic and the remote came with an option button, I press it and, nothing happens? What do I do? Can I make, it, work?

Adds a sun roof

The option button turns the horn beep on and off. This is how to program your key fob to work with the "Option" button: Will work on 2002 model as well:
What does the option button on the 2002 honda civic do

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