The URL contains the protocol prefix, port number, domain name, subdirectory names and file name. Port addresses are generally defaults and are rarely specified. To access a home page on a Web site, only the protocol and domain name are required. User - Any individual who interacts with the computer at an application level. Programmers, operators and other technical personnel are not considered users when working in a professional capacity on the computer.
Users are responsible for performing backups of their local drives.
It provides internetworking of PC's, minis, mainframes, and other computer resources. Virus - Software used to infect a computer. After the virus code is written by some sick, twisted individual, it is buried within an existing program. Once the program is executed, the virus code is activated and proceeds to perform its treachery. File attachments in email messages are a very common way to transport a virus to a large number of victims in a short time.