Article 6ME00 How to identify program printing messages into terminal

How to identify program printing messages into terminal

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usr345
from LinuxQuestions.org on (#6ME00)
Slackware 14.2.
After I log out from KDE to terminal, I start getting messages: "Unable to connect to X server", which makes working in terminal very uncomfortable. How can I identify what program is sending these messages and kill it?
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