Compatibility: 3.1+
Expects: AX    4409H
BL    drive number (0=default, 1=A, 2=B, etc.)
                                                                  
Returns: AX    error code  if CF is set to CY
DX    Bit 12 is 1: Drive is remote  (if no error)
Bit 12 is 0: Drive is local and DX=IoctlDriveInfoRec
                                                                  
Info: Obtains information about a drive, including whether or not it is
remote (on the network).  For local drives, this returns
additional information including, which IOCTL fns it supports,
and whether the drive is a logical drive created by the Subst
command.

On return, DX bit 12 (DX & 1000H) is 1 if the drive is remote
(i.e., on a network server) and all other bits are 0.

See IoctlDriveInfoRec for a layout of the flags returned in DX
when bit 12 is 0 (i.e., not a remote drive).

Notes:   This is the only way to see if a logical drive ID represents a
Subst drive.  It also lets you see if a local drive is shared
by others on the network.

See Also: Fn 44H (IOCTL)
Fn 440AH (Is File/Device Remote)
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DOS Fn 4409H: IOCTL Is Drive Remote or SUBST