How does the keyless Push-To-Start button work in a car?

I plan on buying a new nissan maxima or altima in a few weeks. The reviews show that they are good cars and all but, I'm very concerned about the way you start the car. I know that all you do is like push the button and have the thingy with you in your pocket, but what if I dont want someone driving it. Like... show more I plan on buying a new nissan maxima or altima in a few weeks. The reviews show that they are good cars and all but, I'm very concerned about the way you start the car. I know that all you do is like push the button and have the thingy with you in your pocket, but what if I dont want someone driving it. Like if I'm sitting in the passenger seat with someone else in the drivers seat that I don't want driving . How would that work? Also, how would make a copy of that key like traditional keys because I sometimes tend to misplace them.
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