HTML and CSS Reference
instant feedback, without complicated Common Gateway Interference ( CGI ) scripts and
languages. A CGI script is any program that runs on a Web server for the purpose of pro-
cessing data. The Web page sends the data to the server that processes the data and may
return a result to the Web page. Along with server-side scripts and programs, many Web
sites use CGI for searching databases or processing purchase orders on a server.
The disadvantage of using CGI scripts is that they waste resources when the
can validate a data-entry form, such as a purchase request, immediately on the user's
computer. The need to send the data back to the server for validation is eliminated. The
user receives feedback instantly and does not have to wait for a response during heavy
Internet traffic times.
Reserved words (also called keywords ) are words with special meaning to a programming
language. Most reserved words are used in program statements or in defining data. A reserved
Table G-1 Reserved Words
Table G-2 Future Reserved Words