A method and apparatus for transferring state information between a server computer system and a client computer system. In one embodiment of the method, an http client requests a file, such as an HTML document, on an http server, and the http server transmits the file to the http client. In addition,...http://www.google.com/patents/US5774670?utm_source=gb-gplus-sharePatent US5774670 - Persistent client state in a hypertext transfer protocol based client-server system 
