Four kinds of conversation tracking technology
page: represents the objects and properties associated with a page. A page is represented by a compiled Java servlet class (which can have any include directives, but no include actions).
This includes both Servlets and JSP pages that are compiled into Servlets
Request: represents an object and property that is related to a request made by a WEB client. One request can span multiple pages, involving multiple WEB components (due to the relationship of forward directives and include actions)
session: represents the objects and properties associated with a user experience for a WEB client. A Web session can and will often be requested across multiple clients
Application: represents objects and properties related to the entire WEB application. This is essentially a global scope that spans the entire Web application, including multiple pages, requests, and sessions
Four kinds of conversation tracking technology