Proper use of phpCAS & application session

[Kim Cary]

Sorry for such an elementary question.

For those of you using phpCAS (wonderful! thank you!) - is phpCAS  
maintaining state with the user?

I don't want to tell our developers implement the simple example code  
on their web apps and find that every page makes a call back to the  
CAS server on each access.

I would think that they need to set a cookie to maintain state/login,  
and if the app doesn't find it, send the user to the landing page for  
the app (which will kick them to CAS).

However, on reviewing the examples again, I began to wonder if the  
phpCAS libraries were keeping user state for us.

KC