Newbie Exception with include/Session

How is Session initiated?

[HeadBut]

if Session("Access")="Admin" then
Set Administrator = True
else
Set Administrator = False
end if

this: if Session("Access")="Admin" then

gives me:
error '80020009'
Exception occurred.

Is the session not started yet?
I just set this session in another window then reloaded this page?

[txbakers]

A Session object is created for each web browser session opened. If you don't set one on the first window, the popup could set it, but the first one won't know about it until you log out and login again.

You need someway to set it on the main Window first.

[HeadBut]

I tried going to the signin page then going to the main page as a logged in browser... it doesn't help.

Is there a way to test a session("var") to a string?