A unique identifier, like the address for your home. It helps navigate the traffic between computers as each has its own address.
Best site security I have found.
Steve Popz May
It works very well ... I like it no telling how many times they have saved my computer from crash and burn and it also alerts you of suspicious sites ... love it and it is reasonably priced.
I like the reassurance I have that Guardio is checking up on things for me! They have prevented me from opening some links that were suspicious before I opened them! That was awesome! They also have removed some issues for me. Definitely worth the money!