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Old 20th May 2009
gosha gosha is offline
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Default can't open display error

This is something I guess of very basic unix knowledge, but until now I have not found an answer (also because I can live with it and maybe did not look that hard for it).
The situation: I usually work as a user which is in the wheel group, if I use this user to login as a different user (even root), if I try to use an application that uses graphics I get this error:
Code:
# xpdf
Error: Can't open display:
This is xpdf, but it could be a movie etc.
Why is it?
How can I go around this?
I've read quite a few thread on the web, and if I got the point it has to do with some permission policy, but could not really understand the essence of the problem.

Could anyone explain in a comprehensible way or point me to a good tutorial?
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