A packet of envelopes http://itu.sci.cu.edu.eg/psychosynthesis-ireland-8ce9.pdf unisa electronic theses and dissertations  Nasdaq and CBOE "have to coordinate with the NYSE and theother institutions to make sure they all do the same thingbecause if trades stand at one institution and not at another itcan be a big fallout for the participants and who gets thosetrades," he said.