(PHP4 )
session_unregister -- 
     Unregister a variable from the current session
    
Description
bool session_unregister (string name)
     session_unregister() unregisters (forgets)
     the global variable named name from the
     current session.
    
     This function returns true when the variable is successfully
     unregistered from the session.
     
Note: 
       This function was added in PHP 4.0.