in reply to Re^2: Filenames of "PRN" (or "PrN" etc) on Win32.
in thread Filenames of "PRN" (or "PrN" etc) on Win32.

Only those under the first IO are relevant: 
CON
AUX
PRN
CLOCK\$
LPT\d+
COM\d+

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There's also NUL, not listed.

In Section Meditations