Gluster users - Feb 2017 - difference between a pool and peers

All:

I can see through the API there's a distinction between pool and a peer. My
question is what distinguishes a pool member from a peer? If a node is one
it always seems to be the other. Can I ever have a node be "online" in
a
pool while be an offline peer? What about the reverse? Can I ever have a
node that is a peer but not in a pool?

Thanks,
Joe
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