Also, in my experience, sometimes these programs need to be connected to the internet momentarily at start up for some reason but after they are loaded you can unplug ethernet cable if you like and be offline. Either way, none of these communicate anything out and are all local, but i've had issues booting up with network turned off at the beginning. Probably because some of them use a browser interface and even though you are connecting locally they don't work if you shut it all down.