"a non-real-time system is one that cannot guarantee a response time in any situation, even if a fast response is the usual result"
http://en.wikipedia.org/wiki/Real-time_computing
http://en.wikipedia.org/wiki/Real-time_web
Do you have a better term to describe web-based systems that offer the appearance (to humans) of instant communication with the web server?
http://en.wikipedia.org/wiki/Real-time_web
Do you have a better term to describe web-based systems that offer the appearance (to humans) of instant communication with the web server?