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Problem connecting app to X display server



HI,
I'm new to Debian and LINUX so any help would be greatly appreciated.
 
I am trying to run a simulation program on Debian. It compiles fine (now) but whenever I try to launch the gui it tells me it can't connect to the display and that I need to run:  export DISPLAY=<machine>:0   [or setenv--I'm in BASH so I use export]
 
Running that command produces no error but also doesn't help. I have tried using the machine name and also tried using what appeared to be the display server name. I am not certain I used the actual display server name--where exactly do I find it and what should it look like? (I used defaults on everything except the computer name during install and again during reconfiguration.)
 
I haven't yet discovered what man page to specify for more information, none of the 4 books I have nor the Xfree86 or Debian site have revealed anything useful as yet. Admitedly, I may be asking the wrong questions.
 
Thanks again for any help offered,
Sivea

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