1) There are three scopes on this particular PC, but there are many installations around the country just like it.
2) Trigger level/settings seem to be irrelevant. Even in the Picoscope 6 software, if I use a 4000 series scope (even with only one attached), and i set it to trigger based on ANY set of settings, it will use 100% CPU (at least for one thread worth on one logical core) until it triggers.
3) It is armed to trigger all the time. When it triggers, it takes the data, stores it, and automatically rearms. It may trigger 30 times a day, or as little as once a week. The source of triggers is not man-made.
The other series scopes of Picoscope that I have used do not perform this way. You can arm them, and the CPU sits virtually idle until trigger.