Hi Cees,

I strongly recommend you to use XMLHttpRequest indirectly through 
prototype.js library http://prototype.conio.net/, see also a nice 
tutorial here: http://www.sergiopereira.com/articles/prototype.js.html.

Most useful Prototype functions are: Ajax.Request and Ajax.Updater.

With Ajax.Updater you can send a form to server, get new form back and 
update/replace old form element.

I hope this help you a bit ..
Janko


Cees De Groot wrote:
> I've been asked to show a quick proof-of-concept where a user gives up
> filling in forms, presses the 'call me' button, gets called back by
> the call-center agent, and both parties get essentially the same form
> so they can cooperate on completing it. My idea is to use
> XMLHttpRequest polling to synchronise both forms.
> 
> I don't see any big technical hurdles (certainly not for a
> proof-of-concept ;-)), but if someone has done something like this or
> knows some Javascript code that helps here, I would greatly appreciate
> any help that can get me quicker to the demo...
> 
>