ZK Developer's Guide/Fundamental ZK/ZK User Interface Markup Language/Implicit Objects/Life cycle of page, execution, desktop, session, application

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From small scope to big:
*page
: A single page.
*execution<ref><tt>execution</tt> in ZK is a wrapper of <tt>request</tt> in JSP </ref>
: Processing a request from client side. It can cross pages.
*desktop
: All pages serving the same URL, for one browser tab.
*session
: From user visit the web to user leave or timeout. All following pages are related to same session.
*application
: From the application service start to stop. It is cross session, cross users.

Note that, if you press "F5" to refresh the web page, it's a different desktop, but the same session.

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