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[Das Model]

$ ssh -Y root@123.123.123.123
Password:
Last login: Tue May 13 16:47:58 2008 from sdf123456.xyz.sdfsdf.de
vs1123456:~# xterm
Warning: This program is an suid-root program or is being run by the root user.
The full text of the error or warning message cannot be safely formatted
in this environment. You may get a more descriptive message by running the
program as a non-root user or by removing the suid bit on the executable.
xterm Xt error: Can't open display: %s
xterm:  DISPLAY is not set
vs1123456:~# su ich
ich@vs1123456:/root$ xterm
xterm Xt error: Can't open display:
xterm:  DISPLAY is not set
ich@vs1123456:/root$

Och menno... :(