2002 Corolla factory alarm problem

#1
I just bought a car for my daughter. The woman said she had taken the car in to have the alarm disabled because it went off one night five times. I noticed also that the battery had recently been changed. So does anyone know how this factory alarm system actually works? Is it triggered with a voltage drop? I have read that it can be disabled by turning the key to the on and then off position 5 times, and then starting the car. Anyone done this before? and if so, how do you then re enable it?
 
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