How can nxserver sessions be terminated? I have ubuntu 10.04

Edit:

The problem:
When I'm connecting to another computer a I can't do it with the old session I have to create a new one. I already have four old session that exist (I see them when the computer suggest that I resume one of the old sessions instead of creating a new one)

Thanks

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Please add one or two sentences that explain the circumstances or the correct answer might as well be "shutdown -h now" – bytesum Sep 14 '10 at 13:16
Would it not be better to ask how to resume a session? – Nifle Sep 14 '10 at 13:31
Yes how resume, but I have already 4 sessions and should be only 1 – Yosef Sep 14 '10 at 14:14
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