Can I restart my Mac remotely via screen sharing if the screen shows only linen?

I am currently in Norway. My Mac mini is in my apartment in Australia. I can access screen sharing via Back To My Mac. It connects fine, but the screen has only linen - no menu bar, no dock, no anything else. I am fairly sure that is what is actually on the screen and that it isn't a problem with the connection or anything like that (it's happened once before while I was sitting in the same room...) I know the system is responsive because the one other thing that can poke through my router is the Transmission web interface, and that works just fine. (Unfortunately I seem to have neglected to forward a port for ssh...) Is there any way I can reboot or otherwise regain full use of the system via the limited screen sharing access that I have?