Due to our broad scope we often have overlap with other sites on the network, in some cases it could be seen as useful to be able to close questions as duplicates of those on another site. This will not happen.
We have the answer of let the communities grow themselves and the general inference is that we answer questions as they come in and hope we get that one great canonical answer here. This is what I would prefer to happen.
Lacking that there is the option of copying content from other sites within the SE network, which I find slightly disturbing as it needs to be done very carefully to avoid plagiarism.
So, my question is this: do we accept copying content from other Stack Exchange sites for canonical Q&As or not? Or do we wander the middle line and allow it, but force the Q&As to be Community Wiki?
Sadly I cannot VTC many questions on Superuser as a duplicate of that answer since it is technically another site.
As an [interim] solution I am coping that question/answer here, hoping it will become the canonical answer on SuperUser.
If you can improve on it, please it post an answer or leave comments.