vibroplex
if you enter your pi with ssh -X option, you can also start GUI tools and they will open on your computer.
So, if you have messed up some display option in the GUI and don't know where that is stored, you just call the GUI from your other computer and correct that.
ssh -X rpi
and then every GUI program should work, at least if you have an X running on your computer. So if you are using a Linux or CygWin from Windos. Also you can try to open your RPi with vnc if you have been so wise to have set that up. But I always prefer ssh, because this is so fast and quick, that you don't even "feel" that it is remote, even if you log in to your RPi at home, while you are driving in a train somewhere between Hamburg and some unknown hicksville, in Brandenburg and you are fighting off the wolves from entering your wagon and just want to check, if that order of nuclear ammunition was already affirmed in your Pi at home, you can quickly jump in over the GSM modem in your phone, search for a cellphone connection, but only get a C-Net 9600 baud, because that's normal in Germany, the country with the best infrastructure of the world, if you count from the bottom up, only surpassed by Ghana, then you log into your RPi over those 9600 and it's fine. All is fine. SSH is quick, after you waited for about five minutes to exchange the public key codes.