Static: the VT1200 GUI is an X11 dix server in ROM plus Xlib clients
(SERVER, SESSIONMGR/Terminal Manager, WM, VTE). Internal clients use the
local service "xserver" via the display string "0::0"; TCP 6000 is a
separate authorised listener. Function table and the 4-call hello-window
sequence are in dwt/notes/GUI_APPS.md.
Dynamic: a poke+jump payload proved the firmware ABI (strlen=4) and then
called XOpenDisplay; it never returns (stage 2, display 0, X-server client
watermark unchanged) and the rdebug service dies. Verdict: hard for a
self-contained window; shared-RAM UI mutation (opcode 8) is the working
route.
