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AutoCAD LISP Programming

Active Lisp Pages (ALP) is a server scripting environment for creating dynamic pages and interactive applications over the Web. These pages can then be used in conjunction with any Web server, since the output of the ALP processor can be an HTML page. Here the server does the processing; there is no need to worry about whether a browser can process scripts. The server transmits standard HTML to the browser. Server-side scripts cannot be copied, because only the result of the script is returned to the browser. Since users cannot view the script commands that created the pages they are viewing, the system is secure.

In today's Internet-pervaded world, Web applications are becoming more and more important. We call a Web application a computer program that interacts with the user via Web pages. Construction of Web applications started with CGI-BIN-type interactions. Today they are built in many different fashions such as PHP, Active Server Pages (ASP), Java Servlets, direct server APIs, or Apache Server modules.

Some of these systems share a trait with ALP: the use of server pages. Since browsers understand only static HTML, the server must find a way to generate that. One good solution is to embed scripts in the HTML pages with the help of a programming language. For example, Microsoft's ASP uses Visual Basic, Sun's Java Server Pages (JSP) uses Java, and ALP uses Lisp. The solution that many people used before server pages made their debut was to write a program that then wrote the HTML page.

ALP offers a server page engine that allows the embedding of Lisp scripts within HTML code.

The ALP server page engine solution has several advantages (many of these are shared with other server page solutions):

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