This significantly speeds the loading of previously referenced pages. The same action occurs for any graphics or additional files associated with a page. If the same graphic is used on multiple pages, it will only have to be downloaded once. Can use any programming language and can generate any type of output. The server can pass parameters to a CGI program.
Forms are web pages that send the contents of fields to an active document.
Each field has a name. Active documents are programs downloaded from the server to the browser and run on the clients machine. Popular systems for active documents are ActiveX and Java. Java was developed by Sun Microsystems. The Java language can be used to write ordinary application programs or it can generate applets.