I think in Netscape 4 you could also make a request in an iframe which the server responded to with Content-Type: application/javascript and Transfer-Encoding:

I think in Netscape 4 you could also make a request in an iframe which the server responded to with Content-Type: application/javascript and Transfer-Encoding: chunked. Then every time the server got an event it would write one chunk of javascript, which the client would execute immediately. This script could then call a callback in the parent frame.