[eluser]BrianDHall[/eluser]
Ah, well for one if you are looking for CI session info then you won't find it in _SESSION, because CI by default doesn't use it. Are you trying to get CI session data into your other application?
I'd recommend you just alter it directly. In native CI you should examine $_COOKIE (var_dump), or if you store your CI Sessions in a database you can just pull out the data from there, do a little parsing (I think you have to use unserialize on a portion of it), and then off you go.
Trying to use CI helpers in non-CI applications is usually more trouble than its worth, and for just working with shared session data you'd be best served to just go the direct route.