[galaxy-user] description of "Find diagnostic hits"

Hi, Is there a more detailed explanation on what "Find Diagnostic hits" module in Metagenomic analysis does? Does it take all the hits above user specified cutoffs to one query and return the taxon name if and only if all the hits have the same taxon (my understanding)? Or, does it look at the top few hits or??? Thanks for providing some clarification on the method. Cheers, Will