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Int 21 Fn 4409 - DOS 3.1+ - Ioctl - Check If Block Device Remote [D]
AX = 4409h
BL = drive number (00h = default, 01h = A:, etc)
Return: CF clear if successful
DX = device attribute word
bit 15: drive is SUBSTituted
bit 12: drive is remote
bit 9: direct I/O not allowed
CF set on error
AX = error code (01h,0Fh) (see AH=59h)
Note: on local drives, DX bits not listed above are the attribute word from
the device driver header (see AH=52h); for remote drives, the other
bits appear to be undefined for DOS versions prior to 5.0 (they are
all cleared in DOS 5+)
See Also: AX=4400h,AX=4408h,AX=440Ah,INT 2F/AX=122Bh
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