How the zoo concept can be used in setting the threshold

Hi,
In the biometric concepts and software installation process of computing, I came across a concept that was unfamiliar to me when I was installing the software in our company premises. It was the zoo concept. As I went on to research, I found out that it is a concept that can be applied in the entire process in the biometric setting of the computer machines and also be used in the settings. I wanted to find out how this zoo concept can be used in setting the variable matching threshold to enable me to fully install these applications in all the laptops and PCs at my disposal, via the security log-in machine.
