Once you get gnopernicus to talk, try hitting alt-f2 and if you're lucky you'll be asked for a command to run. It's been a long time since I did anything with gnopernicus, but I think you can tab into a list of available commands and navigate it with up and down arrow keys from there. gnopernicus for now won't run any kde applications but gtk and gnome applications do work to some extent. If you want to run a second command and you've already got the first and second display windows open try alt-f3 for a third window.
