I am getting this error:
Please edit your shell's DISPLAY environment variable to reflect an unlocked terminal that you would like to launch the Domino Setup Program on.

What command do I issue to do this.?
Thanks

Are you running whatever you type to start Domino from within X? If you are, at a terminal type

echo $DISPLAY

You should be returned with

:0.0

or what ever the display is that you are using. If nothing gets returned then something is seriously wrong.
Anyway, to set your shell's DISPLAY environment variable, type

export DISPLAY=:0

Or, when you start Domino, try adding

-display :0

to the command line. This might not work, but it might.
Let me know how you went.

Thanks fuzzyash.

but nope still the same problem. I also get that error at the command line even if x is not started

And yes
echo $DISPLAY yields :0.0

The Domino app you refer to, is it this one --> http://www.lotus.com/products/r5web....x?opendocument ?
I don't know anything about Domino, but I just had a quick look at it's docs & as long as we are talking about the same app I will ask a couple of rather stupid, but important questions. Are you running the setup program you mentioned as the user you should have created to run the Domino Server? Are you running it from within X? (I know that you must be since your DISPLAY variable is set, but it doesn't hurt to ask) Have you followed the install instructions on there website to the letter?

Dont mind the dumb questions Fuzzyash. Its me feeling like a dope here. I just dont know enough about Linux. I've done this install on Suse 8 before and it goes fine. But now I'm trying to do it on Centos (i've tried 4 and now I've backed down to 3.4 but still getting the same issue)

Yes, we are talking about the same app, and yes I've followed the instructions to a T.
The error comes when I attemmpt to start the Domino server after it is installed. I get the same error if I start the server in a terminal or on the command line (that is strange isnt it?). Yes I'm correctly logged in as the Domino server administrator, not root or anyone else.

Thanks for your interest.

What is the terminal app you are using? What window manager does Centos use?