Description: JRun Server Tags (JST) is a technology introduced in Macromedia JRun Server version 3.1 that you can use to implement custom tag handlers in JSP. Custom tag handlers are called when a JSP page invokes the associated custom tag. JST technology uses JSP syntax to bring the power of custom tags to the JSP programmer. JSTs shorten the development cycle, allowing you to develop applications more quickly than with custom tags written in Java. Any JSP page can be used as a custom tag, although you typically use the .jst extension to indicate that a page is a JRun server tag.