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I represent the manufacturer of the TANGO, Biotest Diagnostics and can provide you with some of the information you require. Currently the TANGO is interfaced to HCLL in a unidirectional mode, however, Mediware has completed the bi-directional interface and it has been submitted to the FDA for approval. Approval is expected within the next 30 days after which it will be installed at several sites. The TANGO has a 144 sample capacity, but you can load 1 sample or 144. And you can continue to add more samples at anytime - continuous access. There isn't any limitation that testing on 4 samples have to be complete before adding more samples. Being a third generation instrument, the TANGO is very reliable. Current 12 month average Mean Time Between Failure statistics are at 155 days between failures.