If you ever need to access a CentOS (RHEL for that matter) server remotely, use FreeNX. It’s very easy to install, just follow the instructions on this page:
http://wiki.centos.org/HowTos/FreeNX
Just a note, you can leave the authentication via password (assuming you have a strong one) instead of a key-based pass-through authentication. The instructions are still pretty much the same, only you don’t have to perform some steps.
Performance: wow, it’s pretty fast and it looks just the same as my own desktop. I’m using the NoMachine Client for Ubuntu 8.10.
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