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Here the full communication will result in an operation. The message communication is divided into two parts, each representing a primitive (identification of pillars and the actual get).
Note that the primitive for identification of pillars can cover request to several pillars, while the primitive for the actual get part only concerns one pillar.
Note also that there can be a number of different reponses, in cases where the pillar want to give information of the progress of the ioperation at pillar level. This can for instance be interesting for DVD pillars where there are several possibly time consuming phases in finding the data - even more so for a put operation.
Conversation Id
We generate a unique conversation id at initiation of a conversation such that it is possible to identify which conversation a message belongs to.
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