As Chris Radek stated there is no SMP for EMC2 - the main reason for 
this (as far as I know) is the strict real time behaviour of EMC2.
You could indeed put two machines on one screen but I would strongly 
advice against this.

I have been working in the computer field and used to control two, or 
more, machines from one desk.
Sometimes via ssh/telnet session as two or more machines on one desktop, 
sometimes using KVM and also with physical different screen/keyboards.
If I had to count the number of occasions where I typed the wrong 
command in the wrong screen/window ...
Doing this on a CNC controller could result in disastrous results: 
damaged workpieces, broken mills or even more expensive/painful results.

I always have the controller's screen and keyboard located at the right 
of my machines.
With the E-stop in between the machine and the keyboard.
In that way I always know exactly which machine I am controlling.

Therefor I , again, strongly discourage the control of two machines from 
one screen.
Even in bigger production lines I have seen, where multiple machines 
interact, each machine has its own controller next to it.

Regards,

    Rob

Hubert Bahr wrote:
> I just noticed on another thread a reference SMP with EMC2.   This has 
> me wondering  if it is feasible to have two machines controlled by one 
> computer.  Only one operator is planned.  I have been thinking about 
> using two computers with a KVM switch
>   

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