Open Stack

When we get into things like affinity concerns or managing network 
bandwidth, we see the need for cross-stack relationships.  You may want to 
place parts of a new stack near parts of an existing one, for example.  I 
see that in CFN you can make cross-references between different parts of a 
single stack using the resource names that appear in the original 
template.  Is there a way to refer to something that did not come from the 
same original template?  If not, won't we need such a thing to be 
introduced?  Any thoughts on how that would be done?

Thanks,
Mike
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