Sorry, meant to supply some references:
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.34.5748
http://www2.parc.com/csl/projects/bayou/pubs/sg-pdis-94/SessionGuaranteesPDIS.ps
http://www.cs.utexas.edu/~lorenzo/corsi/cs380d/papers/p172-terry.pdf
I so love CiteSeer!
Antony Blakey
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