[AJAX ASP.NET]Performance

Hi,

I ask myself: if an AJAX aspx page doesn't need anything on the IIS server
and only uses Web services from inside the Javascript to fetch data, is it
necessary to keep a connection/session with IIS ? I guess not !

In that case, how can we "delete" the session with that client in IIS ? I
don't know much in that domain, but I guess that keeping HTTP connections
alive with clients must be resource consuming. So AJAX could save the server
resources.

Oriane