ASP.NET SQL Session db setup problem/confusion

Question

I'm trying to set up an ASP.NET app to use SQL backed sessions.

When I run the following code

Session["test"] = 1;

a row is inserted into the ASPStateTempSessions table in session database, which makes me thing that it is all set up fine.

But when a user logs in, no entry is made in that table. It should be, right? If not, where is the app storing the session information?

Could the app be using in proc session for user login session info, but SQL for other session data?