{HEAD ~ A unique filename} is generated for each screened message and {TAIL ~ a pair} of index node and storage node identifiers are calculated from the unique filename 
{ HEAD ~ A unique filename } is generated for each screened message and { TAIL ~ a pair } of index node and storage node identifiers are calculated from the unique filename
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH