INT 21,44,9 / IOCTL,9 - Device Local or Remote Query

AH = 44h

AL = 09

BL = drive number (0=default, 1=A:, 2=B:, 3=C:, ...)

on return

AX = error code if CF set (see ~DOS ERROR CODES~)

DX = device attribute word

bit 12 = 1 if drive is remote

bit 12 = 0 if drive is local

- used to determine if block device is local or remote

- returns invalid function if networking not started

- implemented from DOS 3.1