Once you have carried out the initial setup procedure as described above, you will not need to touch the satellites again. The satellites are automatically shut down when you switch off the master and reactivated when the master boots. Subsequent firmware updates will also be distributed automatically to the satellites by the master. All changes to the configuration of the screens should be made on the master (locally or via the UMS): Arrangement and resolution of the screens, desktop background for each screen, screensaver etc. Naturally, this applies to all other options too, e.g. sessions.
You can move application windows freely over all the screens and enlarge the windows so that they cover screen boundaries. If you maximize windows, they are usually enlarged to cover the area of the current screen. Depending on the session type, sessions in full-screen format may be restricted to a specific screen or can be expanded across all screens.