t the program or monitor its operation without having to follow cumbersome security procedures. Such entry points also allow a way to get into the program if there is a problem with the access routine. Increasingly, trap doors are used for more nefarious purposes by individuals seeking unauthorized access to systems ("Technologies" n.p.).
A firewall is the most common line of defense for personal and commercial Internet connections and offer considerable business opportunity. Firewalls are gateway computers that isolate local users from the outside world. Within the security perimeter of the local network, users are able to communicate freely and access information freely. Messages sent to or from outside users (such as through a bulletin board) must pass through a firewall computer that checks, routes and labels all information that passes through it. Bulletin boards provide a good example of firewalls in action. Outside users can dial int
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