Determine if a logical device is local or remote (INT 21h, 4409h)

        Entry:
          AX = 4409h
          BX = Drive (0=current, 1=A, 2=B, ...)
        Return:
          CF = 1
               AX = Error Code
          CF = 0
               DX, bit 12 (1000h):
                 0: Local
                 1: Remote