Hiya!
Here is an example of an Amber made page with asynchronous updates,
using server side JS on node.js.
http://tcltalk.ath.cx/amber/examples/tb-pagesTry the "IDE" link to see how it's done :)
To get this going, I had to add the filename extention .sjs to
Apache's cgi-script handler and add the proper bash bang to sjs files,
so that they call node.
Cheers...