INT 21,44,A / IOCTL,A - Handle Local or Remote Query

AH = 44h

AL = 0A

BX = handle

on return

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

DX = device attribute word

bit 15 = 1 if drive is remote

bit 15 = 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