Creating a session with predefined values

[vineesh . kumar]

  
Hi all,
  I have to maintain some information throuh out  whole session from a user 
login to user logout. For accomplishing this, I hav to maintain a userid and 
permission values throughout the whole session.
So what i need to know is, is there any way so that i can create a session with 
these values and retrieve these values from the session, so that the user will 
not come to know that the session contains his uid and permissions?
regards
 vineesh