When I run some programs over SSH, such as firefox &, I get an error 

Error: no display specified

I would like to open many displays, still showing the stdout of each program.

Initial Question: How can I specify the display to get a many-displayed program?

Pablo Santa Cruz gives me the following code as a solution. I do not understand it.

$ export DISPLAY=yourmachine.yourdomain.com:0.0

$ firefox &

What are yourmachine and yourdomain.com in the command?

x11
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