Swap device vs Swap file

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Is there a fundamental difference between a swap device and a swap
file? A swap file can exist on a NFS, can a swap *device* exist over
NFS? Or, is the distinction blurred?

In general, can one have devices over NFS? i.e., have a device node
(say) /dev/console on my local machine, but any operation to
/dev/console (like read(), say) would be routed by the VFS to NFS,
which in turn, sends the request to another computer over the network?

Though there doesn't seem to be logical reason why the above shouldn't
exist; if it didn't, is there a reason why?

Thanks,
-- 
Vimal

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