[wsia] Sessions

As promised (though a bit late) here is a sketch of my current
understanding of the notion of sessions.

(See attached file: Sessions.zip)

Best regards
Carsten Leue

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Dr. Carsten Leue
Dept.8288, IBM Laboratory B鐽lingen , Germany
Tel.: +49-7031-16-4603, Fax: +49-7031-16-4401