The commands from Level I to Level III goes straight from the consoles to the DEVILs via TCP/IP. TCP receive receives buffers and LabVIEW queues accept ad dispatch commands.
A MySQL database — running on a dedicated server — implemets the implements the command, error and warning log services.
...
The TCP connection terminates automatically when the Client stops that is, the control window closes or the LabVIEW process quits (or even crashes). Should any of these condition occouroccur, the corresponding Servlet quits by itself.
...