Marc
1. The update info comes from the Airnav server, which uses the GAS (Gatwick Aviation Societys) server to check if there is no info on the airnav server.
2. It updates the nav database firstly. As the mylog has already been written when it looks for the unknown aircraft it is not updated until next time you see that aircraft. It then sees the info and updates the mylog database.
3. Yes, to both databases eventually
Thats how i think it works, but there are far more knowlegable people on this forum who will correct me if i'm wrong ;-)