Single-Page Application
A single-page application (SPA) is a web application or website that interacts with the user by dynamically rewriting the current web page with new data from the web server, instead of the default method of a web browser loading entire new pages. The goal is faster transitions that make the website feel more like a native app. In a SPA, a page refresh never occurs; instead, all necessary HTML, JavaScript, and CSS code is either retrieved by the browser with a single page load,[1] or the appropriate resources are dynamically loaded and added to the page as necessary, usually in response to user actions. https://en.wikipedia.org/wiki/Single-page_application
http://code.google.com/p/trimpath/wiki/SinglePageApplications
inherently JavaScript, unless someone builds something else into a browser VM
Tiddly Wiki is an example
semi-related: One Page Wiki
semi-related: One Page Site
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