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FinFly USB allows broad snooping on a range of machines. The 'agent' can visit multiple Internet café's, and insert a USB drive on all machines.
If the 'target' uses one of the infected machines, all of their activity will be recorded, including Skype conversations. This is functionality that even the U.S. National Security Agency has reportedly had difficult with; intercepting the peer-to-peer infrastructure that Microsoft recently acquired.
FinFly LAN can inject downloads with spying software. If the 'target' is downloading files from the web, the 'agent' can run the software to discover the 'target' machine.