Domain Name - The permanent URL (absolute address) of a web site that is registered, copyrighted and safe from having anyone else use the same name. Screen - The web page equivalent of a single printed page in portrait format. The content of one printed page is approximately equal to two computer screens stacked on top of each other. Virtual Hosting - A means by which a web site is hosted by another site. A virtually hosted web site has an address that includes the host's address as part of its URL. ie: http://www.all-digit-all.com is our domain name and absolute URL. A virtually hosted site would have the same address with the following example attached after the host name: http://www.all-digit-all.com/virtually_hosted_site_name/ Note: Virtually hosted sites have a lower initial start-up cost than registered domain name sites. URL - Stands for Uniform Resource Locator, the absolute address of a web page.
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Catches all the email 
born viruses 
Prevents worms from 
spreading