Starting with RHEL4, the system only accepts local (socket-based) X11 server connections. This means that if you go to another Unix server and try forwarding X11 output by using DISPLAY variable to point to your RHEL4 box, it will no longer work.
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How To: Find Out the Release Version of Your UNIX
Different UNIX-like operating systems store information about their release versions differently. If you know what OS you have, but not sure about the version, then here's how you can find out:
RedHat Linux
bash-3.1$ cat /etc/redhat-release Red Hat Enterprise Linux Client release 5 (Tikanga)
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