If I want to use GUI apps such as GTK Glade remotely, I could use SSH+X11, but when the SSH session closed all applications I was running died, so I wanted to instead use GDM and login to the same session I'm logged in to locally. XDMCP is old and GDM is refusing to provide access via that protocol (whether remotely or via Xephyr -query localhost from a local session), so I wanted to use a different one, but the only thought in my mind was a VNC server and all of the VNC servers I can find for my GNU distro REQUIRE XDMCP ACCESS (at least to localhost). FOR GOD'S SAKE, I CAN'T USE XDMCP!