TAILIEUCHUNG - Practical TCP/IP and Ethernet Networking- P44

Practical TCP/IP and Ethernet Networking- P44: The transmitter encodes the information into a suitable form to be transmitted over the communications channel. The communications channel moves this signal as electromagnetic energy from the source to one or more destination receivers. The channel may convert this energy from one form to another, such as electrical to optical signals, whilst maintaining the integrity of the information so the recipient can understand the message sent by the transmitter | The Internet 197 describe what kind of information the document contains or how it is organized. XML allows document authors to organize information in a standard way. It is said that XML does for data what HTML does for display . The development of XML is a public project headed by the World Wide Web Consortium and is not owned by a specific company. The group is only open to members of W3C member companies but their work can be followed by viewing the w3c web site. Server side includes Most HTML documents are static - that is the server just sends the client the requested file with no changes. Unless of course the file contains Java or JavaScript applets. Sometimes however the user might want the server to modify the file every time it is accessed. This might be desirable in for example the following cases Updating a counter each time a file is accessed and forwarding this value with the file Including additional text files in a document Including the date last modified in a file or the current date and tie Including the output of a CGI program This can be done using server side includes. The server processes the file this is called parsing and then sends the result to the client. Special commands are included in the following form - command tag1 value1 tag2 value2 - . The server needs to know that the file includes server side includes to be parsed and this can be done by using the extension .html instead of .html. Perl Perl practical extraction and report language is a text processing programming language created written developed and maintained by Larry Wall. It is claimed to have sophisticated pattern matching capabilities and flexible syntax and is used for applications such as input output file processing file management process management and system administration tasks. 12 Internet access Objectives When you have completed this chapter you should know in principle how to Connect your home PC to the Internet using dial-up facilities Connect .

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