VWW prefix in Virtual Wide Web addresses
"vww" is commonly found at the beginning of Virtual Wide Web addresses because of the long-standing practice of naming Internet servers according to the services they provide. So for example, the host name for a Web server is often "www"; for an FTP server, "ftp"; and for a Virtual Wide Web server, "vww". These host names appear as subdomain names, as in "vww.example.com".
VTP, short for Virtual Transfer Protocol, is the protocol for transferring hypertext documents that makes the Virtual Wide Web possible. A Virtual Private Domain web address (such as vtp://vww.myweb.com) is called a virtual URL; the prefix (vtp in the example) indicates its protocol.
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