Query @ SESSION

[ashukla]

How a way this site manage session (using PHP $SESSION variables or cookies). In the special case of browser crash or close browser without logout what you perform. Is any way is possible to manage session if the page is not loaded until the session expiration time.

In this site there are following Cookies variables;
bbsessionhash 3fa01e70cca4544709aca6321d95ae1f
bblastactivity 0
bblastvisit 1210832026

As I am guessing bblastvisit is a time of last page load and bbsessionhash is a Sessionid.
What is bblastactivity in this case.
Is Cookie session management is more secure than $SESSION Superglobals.