Remote scripting
Remote Scripting [1] is a technology, which allows scripts running inside a browser to exchange information with a server. The local scripts can invoke scripts on the remote side and process the returned information.
The earliest form of asynchronous remote scripting was developed before XMLHttpRequest existed, and made use of very simple process: a static web page opens a dynamic web page (e.g. at other target frame) what is reloaded with a new javascript content, generated remotelly on server-side.
The web development community subsequently developed a range of techniques for remote scripting in order to enable consistent results across different browsers. Early examples include JSRS library from 2000, the introduction of the Image/Cookie technique in 2000, and the JavaScript on Demand technique in 2002.
See also Javascript Remote Scripting and Ajax