[orca-list] help with logging out help

[Glenn <glennervin cableone net>]

Hi,
I am running a live session of Zorin.
I installed Voxin, and I need to log out and back in to make Voxin work.
In trying to do that, I get stuck not knowing a password.
I used to know a command that restarted the Gnome desktop, or whatever 
desktop this is running, which basically logged me out and back in again.
Does anyone know the command?
Thanks.