We aren&#x27;t talking about modern web applications and all that entails though, we&#x27;re specifically talking about the ability to load and send content without reloading the page.  That was in use in browsers older than Internet Explorer 5.<p>Netscape Navigator 4 had frustrating limitations once you had the data, but people were doing all sorts with it regardless.  More was possible with Internet Explorer 4, but again, you didn&#x27;t need XMLHTTPRequest.  And if you just want to strip it back to the bare-bones of loading and saving data, a few people were even doing that as far back as Netscape Navigator 2 if I recall correctly – by dynamically loading new images with varying query string parameters.