MB>
  > SIO creates alias devices in addition to the standard ones.  For example,
  > COM1 is aliased by $SIO$1, COM2 is aliased by $SIO$2, etc.
  > Since locking and exclusion are handled by the file system
  > router, there is no contention if the device names are
  > different.
MB>

  If I recall correctly from when I sat down and experimented, they
  aren't mirror images of the COMn devices.  Certainly reading data from
  and writing data to the $SIO$n devices produced wildly different
  results to doing the same with the COMn devices.  I suspect that most
  of the API of the $SIO$n devices is via IOCtls.

  > JdeBP <
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