将xml文件更新从服务器推送到所有客户端浏览器？

I'm wondering if it is possible to push an xml file update from server to all client browsers? Basically my proposed situation is that my server holds an xml file, when a user loads a page that uses said xml file they can request to change it, if the change is allowed (determined by the page client side) then the xml file is updated on the server side. I'm fine up to this point (well, I have plenty of reading to get me to this point). Then I want all pages who are connected to refresh all elements of the page reliant on the xml file with out refreshing the whole page. I'm wondering if it is possible to push an xml