VSPX does not require any particular session management to be in effect to operate. It is in its default form entirely stateless on the server side. There is a mechanism called view state for keeping track of data between consecutive post backs of a single page. This is simply an automatically maintained hidden field which will keep the state of controls which have a state that may be persisted. The view state mechanism does not however safeguard data across different pages but is fine for remembering entered form data or a bookmark in a scrolled list across page reloads.

To keep real sessions and session variables, a v:login control is offered.