A session is created every time a request without the cookie "hsbst" is made. To get the session data the code is:

Session sessionData = req.GetSession()

The session class is quiet simple for the moment, you can only Add or Get attributes

Name	Return Type	Description
SetAttribute<T>(string, T)	void	Set an attribute for a given session
GetAttribute<T>(string)	T	Returns and attribute previously set