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		 Networking, Serial Cable, Parallel Cable.... 
 
Networking on DOS is a bit of a pain, but it can be done.. I suggest doing that if possible. 
 
Not sure what cnc machine is (besides running DOS), but can you run Windows for Workgroups 3.11 on it?  That'll make networking a bit easier. 
		
		
		
		
		
		
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