Int 2F Fn 1123  CU - Network Redirector - Qualify Remote Filename          [N]

   AX = 1123h
   DS:SI -> ASCIZ filename to canonicalize
   ES:DI -> 128-byte buffer for qualified name

Return: CF set if not resolved

Notes: called by MS-DOS 3.1+ kernel, but not called by DR-DOS 5.0 unless the
     filename matches the name of a character device
   called first when DOS attempts to resolve a filename (unless inside an
     AX=5D00h server call); if this fails, DOS resolves the name locally

See Also: AX=1221h,INT 21/AH=60h