At home, I have several machines running Linux/*BSD, and I regularly display windows on my Desktop (currently a Mac Mini running XQuartz). VNC is nice, but X11

At home, I have several machines running Linux/*BSD, and I regularly display windows on my Desktop (currently a Mac Mini running XQuartz). VNC is nice, but X11 has the ability to seamlessly display single windows on another machine. VNC does not do that, at least as far as I know.