INT 21 u - Named Pipes - DosCallNmPipe
        AX = 5F37h
        DS:SI -> DosCallNmPipe stack frame (see below)
Return: CF clear if successful
            CX = bytes read
        CF set on error
            AX = error code
Note:   this function was introduced by LAN Manager but is also supported by
          the Novell DOS Named Pipe Extender, Banyan VINES, OS/2 Virtual DOS
          Machines, and others
SeeAlso: AX=5F36h,AX=5F38h

Format of DosCallNmPipe stack frame:
Offset  Size    Description
 00h    DWORD   timeout
 04h    DWORD   -> bytes read WORD (not used!!)
 08h    WORD    out buffer length
 0Ah    DWORD   address of out buffer
 0Eh    WORD    in buffer length
 10h    DWORD   address of in buffer
 14h    DWORD   address of pipe name

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