Not only are whole files not downloaded in executable form by users, but these professional services police themselves with a vigilance bordering on the fanatic. Insulation refers to the process of knowing where your computer has been and is going electronically. Redundancy is the daily, weekly, and monthly backup routine which creates tape or laser disk backups of all data files. Protection from viruses may seem as easy as insulating computers or networks from any disks, remote services, and on-line downloading. Unfortunately, insulation is easier said than done since absolute control of a computer system is as difficult as unproductive.
Viruses enter through many avenues.
Unwary employees may bring in their prize programs from home for a little after-hours recreation. Adventurous staff may login to a remote FTP site to download the latest shareware games. Disgruntled employees may deliberately upload viruses to fulfill their desire for revenge. Almost any scenario is possible. Yet, security can be achieved with some forethought.