Namespace - which namespace this instance of zend-session is saving-to/getting-from
Namespace locking mechanism
__construct() - This will create an instance that saves to/gets from an instantiated core. An optional namespace allows for saving/getting to isolated sections of the session.
__get() - method to get a variable in this objects current namespace
__isset() - determine if a variable in this objects namespace is set
__set() - method to set a variable/value in this objects namespace
__unset() - unset a variable in this objects namespace.