On X server you can export your display so the apps starts on one server and interfaces shows on another X server. Here is example how to do it.
On remote Linux (192.168.10.5):
# export DISPLAY="192.168.10.9:0"
On local Linux (192.168.10.9):
KDM/GDM/XDM by default on Debian use option -nolisten tcp. You need to remove it to allow X server to accept connections. Restart of display manager is needed.
# xhost + 192.168.10.5
Next step is to start application on remote Linux and it will show on your local Linux X server.