And I thought ASP.Net didn’t have it. And yes, I am talking about this Spring. And the feature in question in Spring’s DWR or direct web remoting.
A feature similar in functionality exists in WCF 3.5 incarnation, namely, “AJAX Integration and JSON Support“. This also allows an ASP.Net AJAX (or w/e it is called these days) client side to call a WCF service endpoint.