A session is a token that encapsulates connectivity to a single Content Server instance.
It is the only supported mechanism to obtain manager instances that interact with Content Server's business objects.
Session is created with user's credentials, therefore, business objects obtained with a
given have access privileges and restrictions for that user.
It is not advisable to cache Session instance in memory and use it across threads.
A new Session instance must be obtained at the beginning of a program's thread and discarded after use.