T-1 is the fastest speed commonly used for networks on the Internet. The protocols that define the Internet. You are using the far-away computer at your own keyboard, and commands differ greatly between telnet sites. A multi-user operating system designed for networks. The address to a source on the Web.
WANs often consist of numerous LANs connected via telephone line or satellite.
XML isn't going to replace everything - it complements it. You can define tags that meet the exact needs of your site. XML does not change the way Web pages look. What XML does is change the way you read documents and it will change the way documents are filed and stored. It's a new technology and think of it as a supplement to the tools with thich we already build web sites.