x forwarding?

[gene heskett]

Greetings all;

2 supposedly identical machines, installed from the same ubuntu-10.04 LTS 
cd that is a special version for LinuxCNC (which used to be emc).

Machines are intel D525MW boards.

ssh -Y first machine works, and uses Display:10:0, ssh -Y second machine 
doesn't, tries & fails to use Display 0:0.

Where & what does it take to enable the 2nd one? (not normally at the same 
time)

Thanks.

Cheers, Gene
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