Accessing PO session data from business objects

Question: Does anyone know if it is possible to access data of the PO
session that invoked a method in a business object from inside the
business object? 

Example: Suppose a user clicks Save button on a webpage, which triggers
invocation of save() method in the corresponding business object. Can I
access this user session information from within the save() method of
this business object?
Thanks.

Oleg

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